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

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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
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 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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