[Koha] error with search.pl

Dear All, i had been running koha sucessfully for the past few months when i got this error last week.tried to fix it but having problems.hope somebody could help me with a solution.The error occurs when i search for an item in OPAC.the Apache error log for your reference. [Sun Nov 07 06:27:02 2010] [notice] Apache/2.2.8 (Debian) configured -- resuming normal operations [Tue Nov 9 14:28:12 2010] opac-search.pl: Undefined subroutine &main::getitemtypeimagelocation called at /usr/share/koha/opac/cgi-bin/opac/ opac-search.pl line 140. [Tue Nov 9 14:30:24 2010] opac-search.pl: Undefined subroutine &main::getitemtypeimagelocation called at /usr/share/koha/opac/cgi-bin/opac/ opac-search.pl line 140. regards, vimal