problem with horde configuration

[bab@urios.edu.ph]

X-Urios College, Butuan City, Caraga, Philippines: My.Urios

greetings !!

i just installed my horde version 2.0 and imp version 3.,but 
when i tried to load my site i got this messages:

Warning: Undefined index: imp 
in /usr/local/apache/htdocs/horde/lib/Registry.php on line 626

Warning: Cannot add header information - headers already sent 
by (output started 
at /usr/local/apache/htdocs/horde/lib/Registry.php:626) 
in /usr/local/apache/htdocs/horde/imp/lib/base.php on line 65


help is very much appreciated 

thank you,

brendan bautista
urios college
butuan city 
philippines


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