The error "Unknown column 'a.client_id" is a known error which appears when the Joomla update did not finish properly.
Besides fixing the database, you should also go to the Discover install and install any of the components, modules, etc listed there. It's actually not relevant which version of Gantry and the template you've used.
The following users have thanked you: Pierre Martin
- Kat05 / QA Lead & Support / Germany