I am, at this stage, getting that same error when trying to perform a large quantity of actions under Virtualmin after upgrading to version 3.14 - this is critical, as suddenly my entire server is dead in the water.
e-mail a& ftp users
edit e-mail aliases
HTTP/1.0 500 Perl execution failed Server: MiniServ/0.01 Date: Mon, 15 May 2006 03:07:32 GMT Content-type: text/html Connection: close
Error - Perl execution failed
Undefined subroutine &virtual_server::ui_checked_columns_row called at /usr/libexec/webmin/virtual-server/list_aliases.cgi line 42.