Angular-cli: ERROR TypeError: Cannot read property 'subscribe' of undefined

[trevans24]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting(I believe bug, not 100% sure)
- [ ] feature request

Versions.

ng version 1.4.4
node: 8.4.0
os: darwin x64

Repro steps.

here is my repo to the code:
Repo

I was running just fine and I have looked into trying to solve the issue. Here is the link to my Stack Overflow Question:
Stack Overflow

I did not run any commands other than ng serve.

The log given by the failure.

Error in the console that came (also in the stack question):

UnlockComponent.html:81 ERROR TypeError: Cannot read property 'subscribe' of undefined
    at UnlockComponent.webpackJsonp.../../../../../src/app/unlock/unlock.component.ts.UnlockComponent.unlock (unlock.component.ts:252)
    at Object.eval [as handleEvent] (UnlockComponent.html:81)
    at handleEvent (core.es5.js:12023)
    at callWithDebugContext (core.es5.js:13493)
    at Object.debugHandleEvent [as handleEvent] (core.es5.js:13081)
    at dispatchEvent (core.es5.js:8615)
    at core.es5.js:9226
    at HTMLButtonElement.<anonymous> (platform-browser.es5.js:2651)
    at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:425)
    at Object.onInvokeTask (core.es5.js:3881)

ERROR CONTEXT 
DebugContext_ {view: {…}, nodeIndex: 120, nodeDef: {…}, elDef: {…}, elView: {…}}
component
:
(...)
componentRenderElement
:
(...)
context
:
(...)
elDef
:
{index: 120, parent: {…}, renderParent: {…}, bindingIndex: 12, outputIndex: 6, …}
elOrCompView
:
(...)
elView
:
{def: {…}, parent: {…}, viewContainerParent: null, parentNodeDef: {…}, context: UnlockComponent, …}
injector
:
(...)
nodeDef
:
{index: 120, parent: {…}, renderParent: {…}, bindingIndex: 12, outputIndex: 6, …}
nodeIndex
:
120
providerTokens
:
(...)
references
:
(...)
renderNode
:
(...)
view
:
{def: {…}, parent: {…}, viewContainerParent: null, parentNodeDef: {…}, context: UnlockComponent, …}
__proto__
:
Object

I have looked a number of times to find if the issue was spelling or camel casing...no avail.

Mention any other details that might be useful.

This Error was not present before today. I haven't had any issues with this until today.

[trevans24]

worked around with a different solution

[adzza24]

What was your solution?

[finalxcode]

+1

[finalxcode]

look this, https://github.com/angular/angular-cli/issues/8421

[SherifZekry93]

what was the solution?

[lenichols]

having the same issue

[Benyaminrmb]

And me too

[chaker89]

same

[Thilini-Weerasinghe]

Having same problem

[gandarez]

having the same problem here when testing

TypeError: Cannot read property 'subscribe' of undefined

[amol-barshile]

yes I also the same problem

[mariemhammami]

I also the same problem

[alex-osman]

same problem

[yogi111]

same problem is occurred in my project also , is there any solution for that?

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