I think that I corrected the plugin.
But, I have a last problem.

It uses this code to recover the list of the categories on a template :

use Links::User::Modify;

my $category = Links::User::Modify::_category_list();
$link->{Category} = $category;

But, that causes an error :

A fatal error has occured:
Undefined subroutine &Links::User::Modify::_category_list called at Plugins

Is There a possible correction?
Thanks again!

Mick