fida - 2007-03-14

i recently installed the plugin 'virtualmin-svn', when i've tried to create a new virtual server for subversion repository, i had had this error message:

"Adding SubVersion directives to website configuration ..
Failed to create virtual server : virtualmin-svn::feature_setup failed : Undefined subroutine &virtual_server::get_apache_virtual called at /usr/libexec/webmin/virtualmin-svn/virtual_feature.pl line 132"

i don't really know the perl language, so i could not understand this error.
can someone help me