Change password in Usermin Fails

When my users try to change their password in Usermin the following error occurs:

Failed to change password : /usr/libexec/webmin/virtual-server/change-password.pl pastorburrell\-mtpleasentbaptistchurch\.org failed :
Old password: richard
New password: 123456
Not a Virtualmin user in mtpleasentbaptistchurch.org

Status: 
Closed (fixed)