Android ClassNotFoundException: Didn’t find class on path

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I don’t know for sure what is your package name, but if it is e.gochat do this.

Add package="e.gochat" to manifest.xml 

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="e.gochat"
    .....
    .....
         >

On each activity declaration for android:name put a dot before activity name:

<activity
    android:name=".MainActivity">
............
</activity>

<activity 
    android:name=".ChatActivity">

EDIT

After your edited I can see e.gochat is your package name.
Now you only need to remove e.gochat from each activity/provider/receiver name as I said in second part of my answer.
Android will add that for you.

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