Error database

Hi, hi have this error now when i try to see the page that contain the pdb_list fields. The browser say:

https://www.myaddress.com/mypage/preview=true&preview_id=1280&preview_nonce=d35df6c02c.

And now do not function also the csv export

How can i solve the problem, i think there is somenthing table broke on my db. Thank you!!!!

https://www.ads-software.com/extend/plugins/participants-database/