Internal error after upgrade to 1.7.4

[panhead]

I just upgraded using 1-Click Upgrade from 1.6.18 to 1.7.4 and now have an 500 internal error. Question is how can I resolve this or how can I roll-back?

 

error:

Warning: scandir(/home/sites/web/prestashop/Adapter/): failed to open dir: No such file or directory in /home/sites/web/prestashop/classes/PrestaShopAutoload.php on line 184

Warning: scandir(): (errno 13): Permission denied in /home/sites/web/prestashop/classes/PrestaShopAutoload.php on line 184

Warning: Invalid argument supplied for foreach() in /home/sites/web/prestashop/classes/PrestaShopAutoload.php on line 184

Warning: scandir(/home/sites/web/prestashop/Core/): failed to open dir: No such file or directory in /home/sites/web/prestashop/classes/PrestaShopAutoload.php on line 184

Warning: scandir(): (errno 13): Permission denied in /home/sites/web/prestashop/classes/PrestaShopAutoload.php on line 184

Warning: Invalid argument supplied for foreach() in /home/sites/web/prestashop/classes/PrestaShopAutoload.php on line 184

Fatal error: Uncaught Error: Class 'Core_Business_ContainerBuilder' not found in /home/sites/web/prestashop/config/bootstrap.php:27 Stack trace: #0 /home/sites/web/prestashop/config/config.inc.php(66): require_once() #1 /home/sites/web/prestashop/index.php(27): require('/home/sites/sit...') #2 {main} thrown in /home/sites/web/prestashop/config/bootstrap.php on line 27

[jetx]

What version of php are you running? What happens if you delete var/cache/class_index.php?

[panhead]

I'm using PHP 7.1. If I delete var/cache/class_index.php I get the error that the site cannot be reached.

[jetx]

Seems like the installation didn't complete. The only realistic comeback (for lack of better advice from anyone with a definitive answer) would be to restore from your latest backup and try again. Never hit one click upgrade without doing your own manual backups of files and db as the rollback.

If you didn't run manual backups you may essentially be stuffed, unless your hosting has a snapshot so it's worth asking them.

[panhead]

I'll try to restore the backup.