Upgrade problem - Unexpected Text:

[wb1986]

Ran into a problem what should we do?

Unexpected Text:
<?xml version="1.0" encoding="windows-1252"?> <br /> <b>Fatal error</b>: Class 'vB5_Config' not found in <b>/home/xxxxxx/public_html/core/vb/api/state.php</b> on line <b>361</b><br />

[wb1986]

Okay now it says
There is a serious error and the page cannot be rendered

[wb1986]

okay the problem only exists for logging in admin account but not for general viewers. What should i do?

[vBDesignerz]

I have this error now as well!!! Can't find a fix anywhere on the web.
Unexpected Text:
<?xml version="1.0" encoding="windows-1252"?>

It's stuck on the last step (14/14) as i tried to upgrade from 5 s pack 1 to s pack 4
Can anyone please help me understand why that's happening?

[Mark.B]

Please start your own topic with full details. Your error is not the same one as the one being discussed here.