java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.nom.sudokuhint/com.nom.sudokuhint.MainActivity}: java.lang.NullPointerException


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Stack trace

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.nom.sudokuhint/com.nom.sudokuhint.MainActivity}: java.lang.NullPointerException
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
	at android.app.ActivityThread.access$800(ActivityThread.java:135)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:136)
	at android.app.ActivityThread.main(ActivityThread.java:5017)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:515)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
	at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
	at com.nom.sudokuhint.Sudoku.stringify(Sudoku.java:44)
	at com.nom.sudokuhint.Sudoku.<init>(Sudoku.java:21)
	at com.nom.sudokuhint.MainActivity.<init>(MainActivity.java:17)
	at java.lang.Class.newInstanceImpl(Native Method)
	at java.lang.Class.newInstance(Class.java:1208)
	at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)
	... 11 more

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