Bootstrap error during upgrade

[MarMis]

I dont know how I manage it, but I always have problems when I try to upgrade with "one-click".

Try to upgrade from 1.6.1.12 to 1.6.1.17. I notice during the upgrade that it popped up with 405 page. So I tried to get back with the backup....But then I had a white page

 

With the following message:

Fatal error: Class 'Adapter_ServiceLocator' not found in /home2/marmis/public_html/tease2please/config/bootstrap.php on line 29

 

I have looked here on prestashop and tried a lot of different sollutions.

Have removed: class_index.php a million times, but still not working

 

What to do next?

[bellini13]

This usually occurs because there is a server side caching engine enabled.  Check with your hosting provider if opcache or memcache or some other sort of php server side cache is being used.