Apache config problem

Am I missing a apckage or something, getting this weird message when i run apacheconfig: Use of uninitialized value in pattern match (m//) at /usr/sbin/apacheconfig li 490.

Apache Config problem: UserDir

My users(3) have their home pages at www..com/~user and now i have added my friends domain to my box and i have to use the new 'NameVirtualHost xxx.yyy.zzz.uuu' and everything is fine. Someday i noticed that my users can go either by my domain or my friend like www.mydoamin.com/~user or www.fri