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    Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

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Could not execute method for android:onClick
java.lang.NumberFormatException: Invalid int: "= ?"	at java.lang.Integer.invalidInt(Integer.java:138)	at java.lang.Integer.parse(Integer.java:410)	at java.lang.Integer.parseInt(Integer.java:367)	at java.lang.Integer.parseInt(Integer.java:334)	at java.lang.Integer.valueOf(Integer.java:525)	at com.ebookfrenzy.mattespelet.PlayActivity.onClick(PlayActivity.java:167)	at java.lang.reflect.Method.invoke(Native Method)	at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)	at android.view.View.performClick(View.java:5198)	at android.view.View$PerformClick.run(View.java:21147)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)