general ole error

Hello,
When I try to open the file LibreOfice says that it need to be repaired. Then, I looked to the formulas I have and I get this ole general error (see pic here: http://s8.postimg.org/bqjc4xqz9/Ole_Error_LIBREoffice_Problem.jpg).

I change all the formulas that did go ok, and save the file. Next time same problem.

This is VERY annoying! I never see something like this. I use libreoffice a lot for several years.

Anyone have the same issue?
Best
António