XF 1.5 Can't access forum / server error

[Monks]

Can anyone tell me why I would get this:

Server Error
Invalid authentication module '' (XF:Core12) specified

1. XenForo_Authentication_Abstract::create() in XenForo/Model/User.php at line 1294
2. XenForo_Model_User->getUserAuthenticationObjectByUserId() in XenForo/Install/Controller/Upgrade.php at line 306
3. XenForo_Install_Controller_Upgrade->actionLogin() in XenForo/FrontController.php at line 369
4. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 152
5. XenForo_FrontController->run() in /home/_____________/public_html/install/index.php at line 18

it appears while attempting upgrade. Have downloaded/uploaded new upgrade files. Same thing

 

[MySiteGuy]

Backup the database. Next, disable plugins by adding this to the bottom of library/config.php

// Turn off listners (plugin hooks)
$config['enableListeners'] = false;

Go back to yourforumname.com/install and see if it is then able to proceed.

 

[Monks]

Thanks. I did that this morning. Same result

The site is currently being upgraded. Please check back later.
and
the error above

 

[xml]

Double check database name is correct in your config.php file