Hi,
The below mod_perl error from log file 
ModPerl::ROOT::ModPerl::Registry::var_web_dev_prg_2epl::handler('Apach
+e2::RequestRec=SCALAR(0x13f454dc)') called at /usr/lib/perl5/vendor_p
+erl/5.8.5/i386-linux-thread-multi/ModPerl/RegistryCooker.pm line 200

[download]
means 
subroutine &ModPerl::ROOT::ModPerl::Registry::var_web_dev_prg_2epl::ha
+ndler called at /usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-mu
+lti/ModPerl/RegistryCooker.pm ?

The subroutine handler from /var/web/dev/prg.pl program?

[download]
Please correct me.

In reply to error clarification by Anonymous Monk

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