[imp] Notice: Undefined index: alternate_login in /kunden/74076_81677/horde/imp/login.php on line 97

[Umbroboy]

When i would like to login in IMP , i get an error message in  the header:

Notice: Undefined index: alternate_login in 
/kunden/74076_81677/horde/imp/login.php on line 97


Then when i click on the login Button it comes an error 500.

[Mon Apr 25 21:17:04 2005] [error] [client 82.135.6.28] Premature end of 
script headers: /kunden/74076_81677//horde/imp/redirect.php

Does somebody have an idea?