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Root Cause Analysis

  1. java.lang.RuntimeException

    Unable to start activity ComponentInfo{flash4life.gespant2015.com.flashreflex20/flash4life.gespant2015.com.flashreflex20.MainActivity}: java.lang.ClassCastException: com.google.android.gms.common.SignInButton cannot be cast to android.widget.Button

    at android.app.ActivityThread.performLaunchActivity()
  2. Android Platform
    ActivityThread.performLaunchActivity
    1. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3255)
    1 frame