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Attempt to invoke virtual method 'void ahmad.saberghadim.kums.app.AppController.addToRequestQueue(com.android.volley.Request, java.lang.String)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void ahmad.saberghadim.kums.app.AppController.addToRequestQueue(com.android.volley.Request, java.lang.String)' on a null object reference	at ahmad.saberghadim.kums.activity.RegisterActivity.registerUser(RegisterActivity.java:182)	at ahmad.saberghadim.kums.activity.RegisterActivity.access$300(RegisterActivity.java:32)	at ahmad.saberghadim.kums.activity.RegisterActivity$1.onClick(RegisterActivity.java:92)	at android.view.View.performClick(View.java:4789)	at android.view.View$PerformClick.run(View.java:19881)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5294)	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:904)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)