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Unfortunately the app has been stopped

Sumit 01-19-17

Unfortunately the app has been stopped

I am getting this error when I am trying to run my app on Android virtual Device

FATAL EXCEPTION: main
Process: com.example.shopclues.firstproject, PID: 2439
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.shopclues.firstproject/com.example.shopclues.firstproject.MainActivity}: java.lang.NullPointerException: Attempt to read from field 'com.optimizely.Optimizely$OptimizelyStartState com.optimizely.Optimizely.startState' on a null object reference

Level 1