Error message on deleting domains

When I attempt to delete a domain (or subdomain), I get this error:

HTTP/1.0 500 Perl execution failed Server: MiniServ/0.01 Date: Sat, 7 Apr 2007 20:27:16 GMT Content-type: text/html Connection: close
Error - Perl execution failed

Undefined subroutine &main::get_autoreply_file_dir called at virtual-server-lib-funcs.pl line 239.