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java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference	at com.android.volley.Request.(Request.java:136)	at com.android.volley.toolbox.StringRequest.(StringRequest.java:43)	at market.enxo.com.marketstore.SignUp$8.(SignUp.java:361)	at market.enxo.com.marketstore.SignUp.signUpWS(SignUp.java:332)	at market.enxo.com.marketstore.SignUp$4.onClick(SignUp.java:297)	at android.view.View.performClick(View.java:5198)	at android.view.View$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)