What to do with perl-support when set ft=perl set in vimrc

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Hi,
Just activated perl-support plugin , if i do set ft=perl inside my
~/.vimrc , thus i'll receive a warning:

Error detected while processing /usr/share/vim/vimfiles/ftplugin/perl.vim:
line 414:
E121: Undefined variable: g:Perl_PerlTags
E15: Invalid expression: has('perl') && g:Perl_PerlTags == 'enabled'
Press ENTER or type command to continue

But if i start vim , and type in "set ft=perl" manually , all goes well.

Am i missing sth. here ?

Many thanks !

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Best Regards,
Aaron Lewis - PGP: 0xDFE6C29E
Key Server: http://keyserver.veridis.com
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No HTML shits , thanks.
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