XF 1.3 Class error on update from 1.3.0 to 1.3.1

[Teascu Dorin]

I get this error when I try to update:

Fatal error: Class name must be a valid object or a string in /home/content/**/*******/html/xen1dev/library/XenForo/Install/Controller/Upgrade.php on line 46

 

[Teascu Dorin]

Anyone?!

 

[Jake Bunce]

Hmm. I'm gonna say an addon is in play here. Try disabling addons before running the upgrade. Or you can disable addons at the code level by adding this line to your library/config.php file:

$config['enableListeners'] = 0;

 

[Jake Bunce]

The error relates to instantiating XenForo_Session. So make sure this file exists:

library/XenForo/Session.php

 

[Teascu Dorin]

Yes. The problem was Session.php. Couldn't be uploaded by FileZilla. I had to uploaded by the hosting File Manager.