java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential.setSelectedAccountName(java.lang.String)' on a null object reference at com.facetleon.ridhamsagar.ivaccine.RegisterFragment$CalendarAsyncTask.doInBackground(RegisterFragment.java:924) at com.facetleon.ridhamsagar.ivaccine.RegisterFragment.calculateDates(RegisterFragment.java:289) at com.facetleon.ridhamsagar.ivaccine.RegisterFragment$3.onClick(RegisterFragment.java:203) at android.view.View.performClick(View.java:5198) at android.view.View$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)
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