No user or group set - set suPHP_UserGroup

[duke28]

i use custombuild
and now i have this problem

with apache 2.2 and suphp 7.x
all is ok but :

if we use http://box11.rapidenet.ca/~aimpact/index.php

its give error 500 and

its said : No user or group set - set suPHP_UserGroup

we cannot use server/~user ...

any clue?