Good day all!

Hey guys, I was wondering if anyone knows anything about an issue I have been having with Pivot Tables and Integrity proplems. I am not sure what caused this melt down but when I opened the file containing the pivot table it was disabled and would no longer funcion. It really put me down for a while but I re-made the table and now all is well......The thing is that this is a giant Pivot Table and I would really like to understand why this happended so to avoid it from happening again.

Any Ideas?