public Yield DeleteGroupUser(DreamContext context, DreamMessage request, Result <DreamMessage> response)
{
PermissionsBL.CheckUserAllowed(DekiContext.Current.User, Permissions.ADMIN);
GroupBE group = GetGroupFromUrl();
UserBE user = GetUserFromUrlMustExist();
group = GroupBL.RemoveGroupMember(group, user);
response.Return(DreamMessage.Ok(GroupBL.GetGroupXmlVerbose(group, null)));
yield break;
}