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Settings-apps-all,look for facebook messenger.Tap on it,force stop,clear data.
it wasn't facebook messenger. just the default sms messenger app. but that also worked. thanks
Nice.
Have you tried the above solution
Message application is not working after 6.0 upgrade
i can't access to my messenger even if i'm already logged in to my facebook account. if i'm trying to open it always pop up error retry