Need Help Dealing With A Fatal Exception Caused By Java.lang.incompatibleclasschangeerror

So, I ran into this error just yesterday in Android Studio that I've never seen before, caused by a piece of code that hasn't been touched over the past 3 months. This came from th

Solution 1:

update may 27:

we just released an update (version 9.0.1) to fix the incompatibility I mentioned in my first edit. Please update your dependencies and let us know if this is still an issue.

Thanks!

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original answer May 20:

The issue you are experiencing is due to an incompatibility between play-services / firebase sdk v9.0.0 and com.android.support:appcompat-v7 >= 24 (the version released with android-N sdk)

You should be able to fix it by targeting an earlier version of the support library. Like:

compile'com.android.support:appcompat-v7:23.4.0'