NullPointerException in VibraActivity

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E/AndroidRuntime(28081): FATAL EXCEPTION: main
E/AndroidRuntime(28081): Process: cri.sanity, PID: 28081
E/AndroidRuntime(28081): java.lang.RuntimeException: Unable to start activity ComponentInfo{cri.sanity/cri.sanity.screen.VibraActivity}: java.lang.NullPointerException
E/AndroidRuntime(28081): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
E/AndroidRuntime(28081): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
E/AndroidRuntime(28081): at android.app.ActivityThread.access$800(ActivityThread.java:135)
E/AndroidRuntime(28081): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
E/AndroidRuntime(28081): at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime(28081): at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime(28081): at android.app.ActivityThread.main(ActivityThread.java:5001)
E/AndroidRuntime(28081): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(28081): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(28081): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
E/AndroidRuntime(28081): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
E/AndroidRuntime(28081): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(28081): Caused by: java.lang.NullPointerException
E/AndroidRuntime(28081): at cri.sanity.PrefActivity.on(PrefActivity.java:104)
E/AndroidRuntime(28081): at cri.sanity.PrefActivity.fullOnly(PrefActivity.java:119)
E/AndroidRuntime(28081): at cri.sanity.PrefActivity.fullOnly(PrefActivity.java:113)
E/AndroidRuntime(28081): at cri.sanity.screen.VibraActivity.onCreate(VibraActivity.java:21)
E/AndroidRuntime(28081): at android.app.Activity.performCreate(Activity.java:5231)
E/AndroidRuntime(28081): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
E/AndroidRuntime(28081): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
E/AndroidRuntime(28081): ... 11 more