Help, I cant log into plesk

[VagaStorm]

When I go to my plesk login page, I get this error: "Fatal error: Call to undefined function: pathbarmaker() in C:\Program Files\SWsoft\Plesk\admin\auto_prepend\auth.php3 on line 386" insted of login fields. I can't find any thing on this error on the web, has any one experiennnnced it? If so, how can it be fixed?

 

[VagaStorm]

This is shown above the error in case it helps anyone. I'm geting slightly desperat :/
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Otputt is so messed it couoldent be copy/pasted. See her:https://85.19.64.210:8443/login.php3

 

[VagaStorm]

I have some functions that works directly from my admin system using rcp api to do some simple tasks like auto creating acounts, resending ftp info and so on. Thhese functions seems to be fully functional wich leads me to belive it's just the web inter face of plesk that is messed up. Not that this givs me any clues as how to fix it tho. :/