Pricing table Editing

Hello,
We have been using your pricing table for a while.
Now when I want to edit it, I get the following response:
"There has been a critical error on this website."
I am not sure how to solve this without rebuilding the whole Pricing table.
I would buy your lifetime package, however, I would like to know up front if that would solve the problem,
Please advise.
Thank you!
George