Crash the moment i click record

[jeffreyliu8]

FATAL EXCEPTION: main
Process: com.example.android.opengl, PID: 32096
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaRecorder.start()' on a null object reference
at com.uncorkedstudios.android.view.recordablesurfaceview.RecordableSurfaceView.startRecording(RecordableSurfaceView.java:364)

and it was because prepare failed:

Couldn't re-init recording
java.io.IOException: prepare failed.
at android.media.MediaRecorder._prepare(Native Method)
at android.media.MediaRecorder.prepare(MediaRecorder.java:1320)
at com.uncorkedstudios.android.view.recordablesurfaceview.RecordableSurfaceView.initRecorder(RecordableSurfaceView.java:350)
at com.uncorkedstudios.android.view.recordablesurfaceview.RecordableSurfaceView.initRecorder(RecordableSurfaceView.java:289)
at com.example.android.opengl.OpenGLES20Activity.onResume(OpenGLES20Activity.java:88)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1603)
at android.app.Activity.performResume(Activity.java:8743)