@joseph samething happened to me. All i had to do... recreate a new database and import previous fields..

if that does not work..
 run fresh installation    and make sure u  install all plugins u had..
then  manually  delete each fields replace with the old one.. for instead: user table u delete new one and replace with old one.. and always check to see if the problem still there ..

yeah fresh install might work but what do I do if I have lost some very important data

back up  your old  database...    

I dont have a old database this just happened

Joseph, did you try reinstalling the plugin? It looks like there is an error with the database table that occurred during the installation.