Initially, I wrote Android test cases. They worked absolutely fine. But after I tried Robolectric and then switched back to Android test framework, I started getting this error. However, after the error,  I get the message Empty test suite. 
The stacktrace:
12:47:08 I/RemoteAndroidTest: Running am instrument -w -r  -e debug false -e class in.dash.dashapp.ApplicationTest  in.dash.dashapp.test/android.test.InstrumentationTestRunner on Nexus_4_API_17_2 [emulator-5554]
12:47:08 I/InstrumentationResultParser: test run failed: 'Instrumentation run failed due to 'java.lang.NullPointerException''