newbie problem; kolab failed

[JOYDEEP]

Dear list ,

I am a newbie. I hv installed kolab 2.1 in suse 10.1 and have the error
when exexcuting

# /kolab/etc/kolab/kolab_bootstrap -b

KOLAB BOOTSTRAP
Check for running webserver on port 80
no host: localhost at /kolab/etc/kolab/kolab_bootstrap line 75, <DATA>
line 225.

could any one kindly suggest how to fix it ?