java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
at android.widget.AdapterView.access$200(AdapterView.java:48)
at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
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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