Deleted my 'calendar'; now Google Cal will not see my google account topic

Hi guys,

I have a rooted T mobile Galaxy S3 running an old rom ( I don't even remember which one).

In an attempt to clean up my phone to speed it up, I may have accidentally deleted some default calendar files (maybe storage files).

As a result, my google calendar no longer is able to connect to my google account. When I launch the app, it just has no where to sign in to my google calendar and simply displays a default calendar.

I have no idea how to fix this.

Please help.

Thanks