Metatag Database updates need to be ran
Just create a local setup of drupal with meta tags module installed. 

Now check for its table structure, if any of the table or column is missing add it manually. Because it can be issue occured you enabled the module. 

Other soluion can be disable metatag module then uninstall it and then re-enable it. It might fix issue for you.
It is just the issue of missing table and column field.

Hope it will help.