[Rtir] Apache Error after Installation of IR add-on

[Andy_R]

Kevin,
Thanks but that does not work for me.
root at rtir:~/RT-IR-2.6.1# perl -l Business::Hours
Can't open perl script "Business::Hours": No such file or directory
root at rtir:~/RT-IR-2.6.1# cpan Business::Hours
Going to read '/root/.cpan/Metadata'
  Database was generated on Thu, 07 Feb 2013 22:53:03 GMT
Business::Hours is up to date (0.10).

If I edit /opt/rt3/etc/RT_Config.pm 
root at rtir:~/RT-IR-2.6.1# vi /opt/rt3/etc/RT_Config.pm 
If the plugins are set to this apache2 starts without erros:

Set(@Plugins,qw(RT::FM));

The Instructions in IR says to change that to this:
Set(@Plugins, 'RT::FM', 'RT::IR');

Now apache2 won't start
[Fri Feb 08 12:58:46 2013] [notice] caught SIGTERM, shutting down
[Fri Feb 08 12:58:52 2013] [error] Can't locate Business/Hours.pm in @INC (@INC
contains: /opt/rt3/bin/../local/lib /opt/rt3/local/plugins/RT-FM/lib
/opt/rt3/local/plugins/RT-IR/lib /opt/rt3/bin/../lib /etc/perl
/usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5
/usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14
/usr/local/lib/site_perl . /etc/apache2) at
/opt/rt3/local/plugins/RT-IR/lib/RT/IR.pm line 56.\nBEGIN failed--compilation
aborted at /opt/rt3/local/plugins/RT-IR/lib/RT/IR.pm line 56.\nCompilation
failed in require at /opt/rt3/bin/../lib/RT.pm line 670.\nCompilation failed in
require at (eval 2) line 1.\n
[Fri Feb 08 12:58:52 2013] [error] Can't load Perl file: /opt/rt3/bin/webmux.pl
for server rtir.nswcsystemsltd.local:0, exiting...

Any ideas?

Kind regards,
Andy
CISSP, GCIA, GCIH, GPEN, GWAPT
InfoSecMatters.blogspot.co.uk