Facebook Authentication - Cannot read property 'login' of undefined

@aviking wrote:

Hello,
Following all the steps from here:
[https://docs.ionic.io/services/auth/facebook-auth.html#logout](

Screen Shot 2017-06-04 at 20.03.42.png2868x1586 356 KB

https://docs.ionic.io/services/auth/facebook-auth.html#logout)

I got the error below on click > FACEBOOK LOGIN button.

Should I mention that I'm launching the app. in Chrome.

Many thanks in advance.

ionic.bundle.js:26799 TypeError: Cannot read property 'login' of undefined
    at ChildScope.$scope.onClickIonicFacebookAuth (controllers.js:168)
    at fn (eval at compile (ionic.bundle.js:27643), <anonymous>:4:263)
    at ionic.bundle.js:65429
    at ChildScope.$eval (ionic.bundle.js:30400)
    at ChildScope.$apply (ionic.bundle.js:30500)
    at HTMLButtonElement.<anonymous> (ionic.bundle.js:65428)
    at defaultHandlerWrapper (ionic.bundle.js:16792)
    at HTMLButtonElement.eventHandler (ionic.bundle.js:16780)
    at triggerMouseEvent (ionic.bundle.js:2953)
    at tapClick (ionic.bundle.js:2942)
    at HTMLDocument.tapTouchEnd (ionic.bundle.js:3069)

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