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java.lang.NullPointerException: 	at dextrosoft.com.schoolmobileapp.LoginFragment.canSignIn(LoginFragment.java:102)	at dextrosoft.com.schoolmobileapp.LoginFragment.onLogin(LoginFragment.java:55)	at dextrosoft.com.schoolmobileapp.LoginFragment$1.onClick(LoginFragment.java:33)	at android.view.View.performClick(View.java:4281)	at android.widget.Button.performClick(Button.java:140)	at android.view.View$PerformClick.run(View.java:17513)	at android.os.Handler.handleCallback(Handler.java:725)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5216)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:798)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:565)	at dalvik.system.NativeStart.main(Native Method)