[Samba] ACL is invalid for set

[Andreas Moroder]

Hello,

when I try to add a group to the list of groups that can access a 
director I get a message in windows and my samba log file contains this 
lines

[2010/08/16 12:15:13.495938,  0] 
modules/vfs_posixacl.c:349(smb_acl_to_posix)
   smb_acl_to_posix: ACL is invalid for set (Das Argument ist ungültig)

where "Das Argument ist ungültig" translates to "The arguments are invalid".

ACLs are activated and I have only set
inherit acls = Yes
in smb.conf

We have Version 3.5.3


Can anyone plesa tell me what is wrong in my configuration

Thanks
Andreas