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Undefined subroutine error

New User

Oct 3, 2012, 11:48 AM

Views: 2853
Undefined subroutine error

I have written a perl script that is supposed to call a subroutine (PrintPageHeader) in another script (PageHeader.pl). (The PrintPageHeader subroutine prints the html code for the header portion of a webpage that is used in several scripts). My calling perl script uses require '/fullpathtoscript/PageHeader.pl'. Later the script calls the subroutine with its parameters PrintPageHeader($ClientName, $ClientLogo);

The problem that I am having is that sometimes I am getting the error message "Undefined subroutine &ModPerl::ROOT::ModPerl::Registry::website_thrasherandheckman_2dsecure_cgi_2dbin_Caseshow_2epl::PrintPageHeader called at /website/thrasherandheckman-secure/cgi-bin/Caseshow.pl line 45. " I cannot understand how this error is happening. It is happening intermittently but regularly. Sometimes, the error will occur when the page initially displays properly and I hit refresh.

Any ideas what might cause this problem?


Oct 3, 2012, 12:57 PM

Views: 2851
Re: [PerlyTrey] Undefined subroutine error

use the module lib and this will add a directory to the @INC where perl stores directories to look threw for modules or scripts. it will need to be in all scripts the require PrintHeader.pl file.

The error is comming from it not finding the PageHeader.pl and useing lib module should fix that.

use lib qw(/usr/bin/dir/to/base/ c:/dir/to/base/); 
use strict;
use warnings;

#require the script
require PageHeader.pl;



Veteran / Moderator

Oct 3, 2012, 4:59 PM

Views: 2842
Re: [PerlyTrey] Undefined subroutine error

Another improvement would be to convert the script into a true module which exports its subs.