I'm having difficulties with a website that's running 7.14.
I did a backup with backup & migrate, installed a new instance of Drupal (7.40), installed the latest versions of all the modules used in the original website
I then restore the database (using backup & migrate also) but I can't create content or create/edit image styles. Whenever I try, I get this error message:
The website encountered an unexpected error. Please try again later.
Any ideas on what causes this error? Or how to solve it?