Tools: Cannot read property 'previous' of null when running polymer build

[GioDavid]

Description

When I was trying to build my polymer project with polymer build I got the error:
cannot read property 'previous' of null

Versions & Environment

• Polymer CLI: 0.11.1
• node: v4.2.1
• Operating System: Ubuntu 14.04

Steps to Reproduce

I create my project that I have in:
https://github.com/Davis22xd/polymer-table

checkout to origin/simple-table branch

I try to build the project with polymer build

Expected Results

vulcanized file

Actual Results

info: Building application...
warn: Unable to uglify file /home/sumitrag-david/Documents/Proyectos/polymer-table/polymer-table.html_script_0.js
info: Generating build/unbundled...
info: Generating build/bundled...
error: Uncaught exception: TypeError: Cannot read property 'previous' of null
error: TypeError: Cannot read property 'previous' of null
at Parser.parseDeclarationOrRuleset (/usr/local/lib/node_modules/polymer-cli/node_modules/shady-css-parser/dist/shady-css/parser.js:192:63)
at Parser.parseRule (/usr/local/lib/node_modules/polymer-cli/node_modules/shady-css-parser/dist/shady-css/parser.js:80:21)
at Parser.parseRules (/usr/local/lib/node_modules/polymer-cli/node_modules/shady-css-parser/dist/shady-css/parser.js:62:25)
at Parser.parseStylesheet (/usr/local/lib/node_modules/polymer-cli/node_modules/shady-css-parser/dist/shady-css/parser.js:55:47)
at Parser.parse (/usr/local/lib/node_modules/polymer-cli/node_modules/shady-css-parser/dist/shady-css/parser.js:51:19)
at css (/usr/local/lib/node_modules/polymer-cli/node_modules/css-slam/index.js:51:39)
at GulpTransform._transform (/usr/local/lib/node_modules/polymer-cli/node_modules/css-slam/index.js:69:36)
at GulpTransform.Transform._read (_stream_transform.js:167:10)
at GulpTransform.Transform._write (_stream_transform.js:155:12)
at doWrite (_stream_writable.js:292:12)

[oneezy]

Any luck on this @Davis22xd ?

I created duplicate around exact same time you did.. issue #306

[GioDavid]

No yet, but I'm looking for it. I hope to find something

[oneezy]

Using polymer build --verbose,

I'm getting these syntax errors:

'SyntaxError: Unexpected character \'#\'',
'SyntaxError: Unexpected character \'`\''

Source Code: https://github.com/oneezy/shopSFI

Full output:

Oneeezy@Oneezy MINGW64 ~/Desktop/www_/_clients/diesel/wwwSFI (firebase)
$ polymer build --verbose
debug:   got args:
{ args: [ 'build', '--verbose' ] }
debug:   got default config from file:
{ config:
   { entrypoint: 'index.html',
     shell: 'src/shop-app.html',
     fragments:
      [ 'src/shop-list.html',
        'src/shop-detail.html',
        'src/shop-cart.html',
        'src/shop-checkout.html',
        'src/app-resources.html' ] } }
debug:   adding command build
debug:   adding command help
debug:   adding command init
debug:   adding command lint
debug:   adding command serve
debug:   adding command test
debug:   running...
debug:   command 'build' found, parsing command args:
{ args: [ '--verbose' ] }
debug:   command options parsed from args:
{ 'sw-precache-config': 'sw-precache-config.js', verbose: true }
debug:   final project configuration generated:
{ root: 'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI',
  entrypoint: 'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\index.html',
  shell: 'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-app.html',
  fragments:
   [ 'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-list.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-detail.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-cart.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-checkout.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\app-resources.html' ],
  inputs:
   [ 'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\index.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-app.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-list.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-detail.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-cart.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\shop-checkout.html',
     'C:\\Users\\Oneeezy\\Desktop\\www_\\_clients\\diesel\\wwwSFI\\src\\app-resources.html' ] }
debug:   Running command...
debug:   building with options
{ sources: undefined,
  swPrecacheConfig: 'sw-precache-config.js',
  insertDependencyLinks: undefined,
  html: {},
  css: {},
  js: {} }
debug:   building via standard build()...
debug:   shell: C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-app.html
debug:   entrypoint: C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\index.html
debug:   dependencies: C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\**\*
debug:   sources: C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\index.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-app.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-list.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-detail.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-cart.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-checkout.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\app-resources.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\**\*,!build,!build/**/*,!bower_components,!bower_components/**/*,!node_modules,!node_modules/**/*
debug:   fragments: C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-list.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-detail.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-cart.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\shop-checkout.html,C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\src\app-resources.html
debug:   no gulpfile found (searched up from C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI)
info:    Building application...
debug:   Reading source files...
debug:   Reading dependencies...
debug:   Analyzing build dependencies...
info:    Generating build/unbundled...
info:    Generating build/bundled...
error:   Uncaught exception: TypeError: Cannot read property 'previous' of null
error:   TypeError: Cannot read property 'previous' of null
    at Parser.parseDeclarationOrRuleset (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:192:63)
    at Parser.parseRule (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:80:21)
    at Parser.parseRulelist (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:153:27)
    at Parser.parseDeclarationOrRuleset (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:212:87)
    at Parser.parseRule (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:80:21)
    at Parser.parseRules (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:62:25)
    at Parser.parseStylesheet (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:55:47)
    at Parser.parse (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\shady-css-parser\dist\shady-css\parser.js:51:19)
    at css (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\css-slam\index.js:51:39)
    at dom5.queryAll.forEach.styleNode (C:\Users\Oneeezy\AppData\Roaming\nvm\v6.3.0\node_modules\polymer-cli\node_modules\css-slam\index.js:45:36)
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\marked-element\demo\index.html_script_0.js
debug:
{ message: 'SyntaxError: Unexpected character \'#\'',
  filename: 0,
  line: 2,
  col: 10,
  pos: 11,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at parse_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1677:9)\n    at Object.next_token [as input] (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1946:9)\n    at next (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2075:25)\n    at Object.parse (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2061:15)\n    at addFile (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:69:33)\n    at C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:77:17\n    at Array.forEach (native)\n    at Object.exports.minify (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:75:26)' }
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\marked-element\test\marked-element.html_script_0.js
debug:
{ message: 'SyntaxError: Unexpected character \'#\'',
  filename: 0,
  line: 2,
  col: 8,
  pos: 9,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at parse_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1677:9)\n    at Object.next_token [as input] (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1946:9)\n    at next (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2075:25)\n    at Object.parse (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2061:15)\n    at addFile (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:69:33)\n    at C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:77:17\n    at Array.forEach (native)\n    at Object.exports.minify (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:75:26)' }
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\marked-element\test\marked-element.html_script_1.js
debug:
{ message: 'SyntaxError: Unexpected character \'`\'',
  filename: 0,
  line: 2,
  col: 0,
  pos: 1,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at parse_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1677:9)\n    at Object.next_token [as input] (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1946:9)\n    at next (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2075:25)\n    at Object.parse (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2061:15)\n    at addFile (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:69:33)\n    at C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:77:17\n    at Array.forEach (native)\n    at Object.exports.minify (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:75:26)' }
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\marked-element\test\marked-element.html_script_2.js
debug:
{ message: 'SyntaxError: Unexpected character \'`\'',
  filename: 0,
  line: 2,
  col: 0,
  pos: 1,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at parse_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1677:9)\n    at Object.next_token [as input] (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1946:9)\n    at next (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2075:25)\n    at Object.parse (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2061:15)\n    at addFile (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:69:33)\n    at C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:77:17\n    at Array.forEach (native)\n    at Object.exports.minify (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:75:26)' }
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\marked-element\test\marked-element.html_script_3.js
debug:
{ message: 'SyntaxError: Unexpected character \'`\'',
  filename: 0,
  line: 2,
  col: 0,
  pos: 1,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at parse_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1677:9)\n    at Object.next_token [as input] (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1946:9)\n    at next (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2075:25)\n    at Object.parse (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2061:15)\n    at addFile (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:69:33)\n    at C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:77:17\n    at Array.forEach (native)\n    at Object.exports.minify (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:75:26)' }
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\marked-element\test\marked-element.html_script_4.js
debug:
{ message: 'SyntaxError: Unexpected character \'`\'',
  filename: 0,
  line: 2,
  col: 0,
  pos: 1,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at parse_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1677:9)\n    at Object.next_token [as input] (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1946:9)\n    at next (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2075:25)\n    at Object.parse (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2061:15)\n    at addFile (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:69:33)\n    at C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:77:17\n    at Array.forEach (native)\n    at Object.exports.minify (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:75:26)' }
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\web-component-tester\data\index.html_script_0.js
debug:
{ message: 'SyntaxError: Unexpected token: operator (<)',
  filename: 0,
  line: 1,
  col: 6,
  pos: 6,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at croak (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2089:9)\n    at token_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2097:9)\n    at unexpected (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2103:9)\n    at expr_atom (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2630:9)\n    at maybe_unary (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2792:19)\n    at expr_ops (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2827:24)\n    at maybe_conditional (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2832:20)\n    at maybe_assign (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2856:20)' }
warn:    Unable to uglify file C:\Users\Oneeezy\Desktop\www_\_clients\diesel\wwwSFI\bower_components\web-component-tester\data\index.html_script_2.js
debug:
{ message: 'SyntaxError: Unexpected token: operator (<)',
  filename: 0,
  line: 2,
  col: 21,
  pos: 22,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1545:18)\n    at js_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:1553:11)\n    at croak (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2089:9)\n    at token_error (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2097:9)\n    at unexpected (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2103:9)\n    at expr_atom (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2630:9)\n    at maybe_unary (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2792:19)\n    at expr_ops (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2827:24)\n    at maybe_conditional (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2832:20)\n    at maybe_assign (eval at <anonymous> (C:\\Users\\Oneeezy\\AppData\\Roaming\\nvm\\v6.3.0\\node_modules\\polymer-cli\\node_modules\\uglify-js\\tools\\node.js:1:0), <anonymous>:2856:20)' }

[oneezy]

It looks as if this might be a css syntax problem (shady css parser ?).

raydaly from SO wrote:
(source)

I was seeing the same error message of "Cannot read property 'previous' of null" when using polymer build for six files. I found an error in the CSS for one of my component files. Specifically, instead of curly brackets I had used regular brackets. Once corrected, everything built correctly.

So I suggest that you examine the CSS for each component file. Probably a CSS error is stopping the build. To find the error, I went file by file and deleted the CSS until the build would work correctly. Once I had the component file that contained the bad CSS, I then deleted one line at a time until I found the error. If you CSS is long, you might try CSS lint.

Alan from SO wrote:
(source)

I had this same problem and saw that there were several issues #191 reporting it.

It seems a fix has been already merged #199 and is part of v0.9.0 but I'm not completely sure if the fix is up on npm just yet.

[FredKSchott]

I can reproduce this as well. It seems like CSS errors will stop the build stream, so make sure you don't have any in your source files. I'll be doing some work around this soon to turn these into warnings (similar to how uglify warns but doesn't exit).

[oneezy]

@FredKSchott , I ended up fixing this by deleting some unused folder/files that I had pulled in to reference from an older version of my project..but I'm unsure if it was tied directly to making the build fail.

If files exist within your app that aren't being used, do they still get processed into the build to cause these errors? It would be nice if the CLI automatically knew to not include these..or maybe adding an extra command polymer build minimal or something.

Also, I'm curious why polymer build minifies files, but does not concatenate files together? Is this the correct behavior?

build > bundled > bower_components:

[FredKSchott]

@oneezy the latest published version of polymer-cli (naively) includes all files that could possibly be needed, which includes your bower_components directory by default (:-1:). The next version (soon to be published) uses our new polymer-build library, which is now smart enough to know which files your build needs and which it does not.

Feel free to check out the master branch and use the new build pipeline today. And we're getting ready to publish a new release in the next few days.

[oneezy]

Great news! Thanks for the update. I'll check it out.

[FredKSchott]

Fixed in v0.13.0

[GioDavid]

Great new thanks