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java.lang.NullPointerException: string == null	at java.util.StringTokenizer.(StringTokenizer.java:95)	at java.util.StringTokenizer.(StringTokenizer.java:75)	at com.example.sumittifane.emoextraction.MainActivity.onClick(MainActivity.java:54)	at android.view.View.performClick(View.java:4802)	at android.view.View$PerformClick.run(View.java:20102)	at android.os.Handler.handleCallback(Handler.java:810)	at android.os.Handler.dispatchMessage(Handler.java:99)	at android.os.Looper.loop(Looper.java:189)	at android.app.ActivityThread.main(ActivityThread.java:5529)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)