[Koha] Syntax error in pages.pl

Hi, After following the steps to set up koha as a CMS, i followed the steps (creating pages.pl, etc) but on testing page i created, i get the following error; Global symbol "$cgi" requires explicit package name at /usr/share/koha/opac/cgi-bin/opac/pages.pl line 63 syntax error at /usr/share/koha/opac/cgi-bin/opac/pages.pl line 68, near "){" Execution of /usr/share/koha/opac/cgi-bin/opac/pages.pl aborted due to compilation errors where line 63 is; my $page = "page_" . $cgi->param('p');