Electron-builder: javaScript error occurred in the main process

Created on 11 Mar 2020 · 12Comments · Source: electron-userland/electron-builder

Version 21.2.0

Target: Windows x64

My Electron app runs fine using electron from the command line, but after I've built it from an executable and try to run it I get:

[Window Title]
Error

[Main Instruction]
A JavaScript error occurred in the main process

[Content]
Uncaught Exception:
Error: The specified module could not be found.
\\?\C:\Users\username\AppData\Local\Temp\808c0bf6-a0f1-4211-a312-7c0cce29173a.tmp.node
    at process.func (electron/js2c/asar.js:140:31)
    at process.func [as dlopen] (electron/js2c/asar.js:140:31)
    at Object.Module._extensions..node (internal/modules/cjs/loader.js:922:18)
    at Object.func (electron/js2c/asar.js:140:31)
    at Object.func [as .node] (electron/js2c/asar.js:149:18)
    at Module.load (internal/modules/cjs/loader.js:735:32)
    at Module._load (internal/modules/cjs/loader.js:648:12)
    at Module._load (electron/js2c/asar.js:717:26)
    at Function.Module._load (electron/js2c/asar.js:717:26)
    at Module.require (internal/modules/cjs/loader.js:775:19)

[OK]

I don't know how to reproduce the error yet. Does anyone know why the app is attempting to load a module from AppData\Local? What module is this? How do I debug this problem?

backlog

Source

ajmetal

Most helpful comment

I eventually discovered this issue is caused by a custom native node module I had created. If a native module fails to load for a myriad of reasons it will present with: Error: The specified module could not be found.

In my case there was a missing dependency the native node module required.

ajmetal on 9 Jun 2020

👍3

All 12 comments

Your app is trying to run a .node file from the %temp% directory. The reason behind this issue is that Windows cannot run node|dll|exeutable files from the asar package => so it copies them to %temp% and tries to execute them there.

To fix this, add this to your electron-builder configuration

"asarUnpack": ["**/*.node"]

aabuhijleh on 12 Mar 2020

👍2

I have a similar error.

electron/js2c/asar.js:138 Uncaught (in promise) Error: The specified module could not be found.
\\?\C:\Users\User\AppData\Local\Temp\b3ccaeda-cfb0-43e5-868c-cab1254fdf7d.tmp.node
    at process.func (electron/js2c/asar.js:138)
    at process.func [as dlopen] (electron/js2c/asar.js:138)
    at Object.Module._extensions..node (internal/modules/cjs/loader.js:828)
    at Object.func (electron/js2c/asar.js:138)
    at Object.func [as .node] (electron/js2c/asar.js:147)
    at Module.load (internal/modules/cjs/loader.js:645)
    at Function.Module._load (internal/modules/cjs/loader.js:560)
    at Module.require (internal/modules/cjs/loader.js:685)
    at require (internal/modules/cjs/helpers.js:16)
    at Object.<anonymous> (C:\Users\User\AppData\Local\Programs\Labmate\resources\app.asar\node_modules\opencv4nodejs\lib\cv.js:58)
    at Object.<anonymous> (C:\Users\User\AppData\Local\Programs\Labmate\resources\app.asar\node_modules\opencv4nodejs\lib\cv.js:69)
    at Module._compile (internal/modules/cjs/loader.js:786)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:798)
    at Module.load (internal/modules/cjs/loader.js:645)
    at Function.Module._load (internal/modules/cjs/loader.js:560)
    at Module.require (internal/modules/cjs/loader.js:685)

https://github.com/justadudewhohacks/opencv4nodejs/issues/707

but the

"asarUnpack": ["**/*.node"]

doesn't help.