System error

error:  Can't locate object method "header_in" via package "Apache2::RequestRec" at /webroot/malcolmmason/maryfernandezmorris.com/aveyron/index.html line 24.
context: 
... 
20: 
21:  <p class="spacer">&nbsp;</p>
22: 
23:  <p class="links" style="margin-top: 0px;">
24:  % if ($r->header_in("Referer")) {
25:  <a class="piclink" href="<% $r->header_in("Referer") %>" style="margin-right: 14px;">retour</a>
26:  % }
27:  <& SELF:links &></p>
28: 
... 
code stack:  /webroot/malcolmmason/maryfernandezmorris.com/aveyron/index.html:24
/webroot/malcolmmason/maryfernandezmorris.com/autohandler:28
raw error






























Can't locate object method "header_in" via package "Apache2::RequestRec" at /webroot/malcolmmason/maryfernandezmorris.com/aveyron/index.html line 24.


Trace begun at /usr/share/perl5/HTML/Mason/Exceptions.pm line 129
HTML::Mason::Exceptions::rethrow_exception('Can\'t locate object method "header_in" via package "Apache2::RequestRec" at /webroot/malcolmmason/maryfernandezmorris.com/aveyron/index.html line 24.^J') called at /webroot/malcolmmason/maryfernandezmorris.com/aveyron/index.html line 24
HTML::Mason::Commands::__ANON__ at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0xa9adbf0)') called at /usr/share/perl5/HTML/Mason/Request.pm line 1278
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1268
HTML::Mason::Request::comp(undef, undef, undef) called at /usr/share/perl5/HTML/Mason/Request.pm line 937
HTML::Mason::Request::call_next('HTML::Mason::Request::ApacheHandler=HASH(0x938caa0)') called at /webroot/malcolmmason/maryfernandezmorris.com/autohandler line 28
HTML::Mason::Commands::__ANON__ at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0xa9943a8)') called at /usr/share/perl5/HTML/Mason/Request.pm line 1276
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1268
HTML::Mason::Request::comp(undef, undef, undef) called at /usr/share/perl5/HTML/Mason/Request.pm line 467
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 467
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 419
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x938caa0)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 165
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0x938caa0)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 831
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0xa98c190)', 'Apache2::RequestRec=SCALAR(0xa0bce40)') called at (eval 795) line 8
HTML::Mason::ApacheHandler::handler('HTML::Mason::ApacheHandler', 'Apache2::RequestRec=SCALAR(0xa0bce40)') called at -e line 0
eval {...} at -e line 0