Are you on WP8.1 Update 1 (Cyan doesen't matter)?
I think this is a storage problem, you don't have enough free space, delete an app or two and try reupdating
i have 400 MB free space in my memory card but music app is installed in phone memory this i have 1.3 gb free phone space and yes, I'm on dp gdr 1 wp 8.1 with Lumia cyan