java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rdsj.aircraft/com.rdsj.aircraft.keterangan}: java.lang.NullPointerException

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java.lang.NullPointerException:
at com.rdsj.aircraft.keterangan.checkResult(keterangan.java:101)
at com.rdsj.aircraft.keterangan.onCreate(keterangan.java:77)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
at android.app.ActivityThread.startActivityNow(ActivityThread.java:2035)
at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:749)
at android.widget.TabHost.setCurrentTab(TabHost.java:413)
at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:154)
at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:546)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

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