RT installation problem - PLEASE help me

My system:

CentOS release 4.4 (Final)

Apache/2.2.3 (Unix) mod_ssl/2.2.3 OpenSSL/0.9.7a PHP/5.2.3 mod_perl/2.0.3 Perl/v5.8.5

apache config:

Alias /rt “/opt/rt3/share/html”

PerlModule Apache2::compat

PerlModule Apache::DBI

PerlRequire /opt/rt3/bin/webmux.pl

<Directory /opt/rt3/share/html>

AllowOverride All

Options ExecCGI FollowSymLinks

Order allow,deny

Allow from all

<Location /rt>

RewriteEngine On

RedirectMatch permanent (.*)/$ $1/index.html

AddDefaultCharset UTF-8

SetHandler perl-script

PerlHandler RT::Mason

When I try to access RT, the following error is seen in httpd error log:

[Wed Jun 6 20:36:48 2007] [crit]: The ‘comp’ parameter (undef) to
HTML::Mason::Request::CGI->new() was an ‘undef’, which is not one of
the allowed types: scalar object

Stack:

[/usr/lib/perl5/site_perl/5.8.5/HTML/Mason/CGIHandler.pm:127]

[/usr/lib/perl5/site_perl/5.8.5/HTML/Mason/CGIHandler.pm:63]

[/opt/rt3.6/bin/webmux.pl:123]

[-e:0] (/opt/rt3.6/bin/webmux.pl:125)

Please give me a hint on where to look.

Thanks

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