Recently I updated a Joomla based website from V1.9 to 3.0 because my provider had to switch to PHP 7.0. Everything works and the migration was successful including updating all the plugin (or disabling the ones I'm not using)
The only issue I'm encountering is when I go to the admin section > template > styles I can't edit my template and receiving an error "404 Component not found. " It looks like something is wrong with Gantry 4.0 but I can't seem to fix the issue.
For a Joomla pro this shouldn't be an issue but I'm limited in fixing this error.
All active plugins are updated