email refresh

I am getting the following error when downloading mails,

Hi
This is my frustration when downloading mail(refresh)
An Item with the same key already been added, then after this message , SQL logic error or missing table “RemoteUids” already
exists
Now no mail gets downloaded, tried to restore a backup, downloads mail the 1st time then fails with the same error.

Help I need this problem solved, my business is standing still