i am coding an android app and i keep getting this error.
java.lang.RuntimeException: Unable to resume activity {com.blogspot.tipsberk.ultimatemap/com.blogspot.tipsberk.ultimatemap.SignupActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3239)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2613)
at android.app.ActivityThread.access$800(ActivityThread.java:178)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5637)
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:959)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
at com.blogspot.tipsberk.ultimatemap.SignupActivity.onResume(SignupActivity.java:101)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1267)
at android.app.Activity.performResume(Activity.java:6178)
this is what is on line 101
98: @Override
99: protected void onResume() {
100: super.onResume();
101: progressBar.setVisibility(View.GONE);
102: }
PLEASE how do i go about this?
