adduser error

[Brett Wiggins]

Hi everyone,
   I am having some problems adding new users to my system. When I use adduser or sysinstall to create a user I get the following error message;
       pw: user 'testuser' disappeared during update
       adduser: ERROR: There was an error adding user (testuser).

What does this error message mean? Is there another way to add a user that I have missed? I am using FreeBSd 5.2.1 -RELEASE.

Brett