java.lang.RuntimeException

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    • 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(ActivityThread.java:3255)

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