Calender Storage APK Problem

Need a little help from you guys please, I have a rooted lg g4 and have done a very stupid thing. I was trying to uninstall the stock calendar app to replace it with google calendar however i uninstalled calendar storage and now i cant get any calendar app to work! I did make a backup before i uninstalled it and i took the APK from the backup and moved it into system/app and changed the permissions then rebooted the phone and the app is back however google calendar still doesnt work it keeps saying that unfortunately calendar storage has stopped working! I have tried clearing the cache in both google calendar and calendar storage. PLEASE help if you can, thank you very much for any insight