The only things that could fix it on your side would be to delete it from your storage and reinstall. Other then that. You'll either have to contact rockstar if it's only happening to you. Your Provider, or wait for Xbox to fix their service. There has been a service alert almost every dayI go to play online and ge tthis error message :
Files required to play GTA Online could not be downloaded from the Rockstar Games Service.
Please return to Grand Theft Auto V and try again later."
How do I fix this?