You've updated your mod_perl modules, but you have to restart the web server for Apache to notice the change.
Use Apache::StatINC (standard with mod_perl) to automatically reload any code when it changes on disk:
PerlModule Apache::StatINC PerlInitHandler Apache::StatINC
Or use the CPAN module Apache::Reload to limit the monitoring to specific modules:
PerlModule Apache::Reload PerlInitHandler Apache::Reload PerlSetVar ReloadAll Off PerlSetVar ReloadModules "Example::One Example::Two Example::Three"
Apache::Reload includes the functionality of Apache::StatINC. Simply saying:
PerlModule Apache::Reload PerlInitHandler Apache::Reload
is enough to duplicate the functionality of Apache::StatINC. That is, at the start of each request, Apache::Reload goes through all currently loaded modules, checking timestamps to see which have changed. Because checking every module on every request is a burden on popular sites, Apache::Reload also lets you specify which modules to check and reload.
The documentation for the Apache::StatINC and Apache::Reload modules; Recipe 8.1 in mod_perl Developer's Cookbook; the mod_perl guide at http://perl.apache.org/guide
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