Error at Proxy Install on LDAP server

[danny.sierra@omtech.net]

Hi guys, i'm installing a zimbra 5.0.5 NT on a rhel 5.1 at a multiserver architecture, so i decided to have zimbra proxy at ldap server, installation was ok, but when i do a zmcontrol start y got this error:

Starting imapproxy...FAILED
2008/05/12 12:50:13 [emerg] 5568#0: invalid number arguments in "auth_http" directive in /opt/zimbra/conf/nginx.conf:101

imapproxy Stopped
nginx is not running
memcached is running

i got an error at hostname of my server, i solve it and do a zmcontrol start and all goes right but i still curious about this error, anyone knows why it could happened? thanks any help