RTAddressRegexp and ExternalAuth error

I have installed Net::LDAP in cpan and installed all dependencies. I am getting the following error messages after restarting apache2 (fails):

[Wed May 26 18:06:11 2010] [error]: The RTAddressRegexp option is not set in the config. Not setting this option results in additional SQL queries to check $
[Wed May 26 18:06:23 2010] [error]: The RTAddressRegexp option is not set in the config. Not setting this option results in additional SQL queries to check $
[Wed May 26 14:06:32 2010] [notice] Apache/2.2.11 (Ubuntu) PHP/5.2.6-3ubuntu4.5 with Suhosin-Patch mod_perl/2.0.4 Perl/v5.10.0 configured – resuming normal$
[Wed May 26 14:43:40 2010] [notice] caught SIGTERM, shutting down
[Wed May 26 14:43:43 2010] [error] Can’t locate RT/Authen/ExternalAuth.pm in @INC (@INC contains: /opt/rt3/bin/…/local/lib /opt/rt3/bin/…/lib /etc/perl /u$
[Wed May 26 14:43:43 2010] [error] Can’t load Perl file: /opt/rt3/bin/webmux.pl for server UHC:80, exiting…
[Wed May 26 14:50:22 2010] [error] Can’t locate RT/Authen/ExternalAuth.pm in @INC (@INC contains: /opt/rt3/bin/…/local/lib /opt/rt3/bin/…/lib /etc/perl /u$
[Wed May 26 14:50:22 2010] [error] Can’t load Perl file: /opt/rt3/bin/webmux.pl for server UHC:80, exiting…
[Wed May 26 18:51:11 2010] [error]: The RTAddressRegexp option is not set in the config. Not setting this option results in additional SQL queries to check $
[Wed May 26 18:51:22 2010] [error]: The RTAddressRegexp option is not set in the config. Not setting this option results in additional SQL queries to check $
[Wed May 26 14:51:32 2010] [notice] Apache/2.2.11 (Ubuntu) PHP/5.2.6-3ubuntu4.5 with Suhosin-Patch mod_perl/2.0.4 Perl/v5.10.0 configured – resuming normal$
[Wed May 26 15:01:43 2010] [notice] caught SIGTERM, shutting down
[Wed May 26 15:01:46 2010] [error] Can’t locate RT/Authen/ExternalAuth.pm in @INC (@INC contains: /opt/rt3/bin/…/local/lib /opt/rt3/bin/…/lib /etc/perl /u$
[Wed May 26 15:01:46 2010] [error] Can’t load Perl file: /opt/rt3/bin/webmux.pl for server UHC:80, exiting…
[Wed May 26 15:15:41 2010] [error] Can’t locate RT/Authen/ExternalAuth.pm in @INC (@INC contains: /opt/rt3/bin/…/local/lib /opt/rt3/bin/…/lib /etc/perl /u$
[Wed May 26 15:15:41 2010] [error] Can’t load Perl file: /opt/rt3/bin/webmux.pl for server UHC:80, exiting…
[Wed May 26 19:16:22 2010] [error]: The RTAddressRegexp option is not set in the config. Not setting this option results in additional SQL queries to check $
[Wed May 26 19:16:34 2010] [error]: The RTAddressRegexp option is not set in the config. Not setting this option results in additional SQL queries to check $
[Wed May 26 15:16:43 2010] [notice] Apache/2.2.11 (Ubuntu) PHP/5.2.6-3ubuntu4.5 with Suhosin-Patch mod_perl/2.0.4 Perl/v5.10.0 configured – resuming normal$

I am not sure what I am doing wrong. Please help…