LinuxQuestions.org - Unknown parameter encountered: "valid user"

HI all Gurus,
I am running a Samba server on Red Hat linux 9.Some users are accessing
this Samba server from windows'98 machine.
Today morning,suddenly some users are not getting write access on the files stored on the Samba server.While viewing the status of the samba server,using 'smbstatus',i got following message :
[root@server root]# smbstatus
Unknown parameter encountered: "valid user"
Ignoring unknown parameter "valid user"
Unknown parameter encountered: "valid user"
Ignoring unknown parameter "valid user"
Unknown parameter encountered: "valid user"
Ignoring unknown parameter "valid user"
ERROR: Badly formed boolean in configuration file: "@users".
Samba version 2.2.7a
Service uid gid pid machine
----------------------------------------------
IPC$ nobody nobody 2801 phoenix (192.168.1.222) Tue Jan 1 15:23:58 2008
IPC$ shivaprasad shivaprasad 2686 plspl-18 (192.168.1.65) Tue Jan 1 14:43:06 2008
temp sankar users 3908 plspl-10 (192.168.1.10) Tue Jan 1 14:50:04 2008
wsjobs gramya gramya 2736 plspl-34 (192.168.1.233) Tue Jan 1 14:43:12 2008
multimedia sharath sharath 3908 plspl-10 (192.168.1.10) Tue Jan 1 14:48:56 2008
PhoenixL_A chander users 5670 plspl-26 (192.168.1.75) Tue Jan 1 14:55:47 2008
apartment shivaprasad shivaprasad 2686 plspl-18 (192.168.1.65) Tue Jan 1 14:42:53 2008
arts santhosh santhosh 2706 plspl-31 (192.168.1.74) Tue Jan 1 14:42:57 2008
club ranjini ranjini 6859 plspl-7 (192.168.1.187) Tue Jan 1 15:02:21 2008
PhoenixL chander chander 5670 plspl-26 (192.168.1.75) Tue Jan 1 14:55:47 2008
club vembu1 users 3072 a9t8g4 (192.168.1.235) Tue Jan 1 14:44:31 2008
............................some more lines are there,i am truncating....

Locked files:
Pid DenyMode Access R/W Oplock Name
--------------------------------------------------------------
3908 DENY_WRITE 0x20089 RDONLY NONE /hdc160GB/multimedia/home/umashankar/rotary/inner_wheel_Club_bangalore/2007/jyothi_issues/edited/jyothi_issue1.pdf Tue Jan 1 15:20:50 2008
3908 DENY_WRITE 0x2019f RDWR EXCLUSIVE+BATCH /hdc160GB/multimedia/home/umashankar/rotary/inner_wheel_Club_bangalore/2007/jyothi_issues/edited/jyothi-volume-14.jpg Tue Jan 1 15:18:54 2008
4732 DENY_NONE 0x1 RDONLY EXCLUSIVE+BATCH /hdc160GB/admin/accounts/docs/bills/Pls - Sales- Service 2007-08/73 - 2008-01-01 Smruti Ranjan Sarangi.pdf Tue Jan 1 15:23:54 2008
2706 DENY_NONE 0x1 RDONLY EXCLUSIVE+BATCH /hdc160GB/programmers/projects/arts/information/dummy collection/Images/5_th.jpg Tue Jan 1 15:21:55 2008
5670 DENY_WRITE 0x3 RDWR EXCLUSIVE+BATCH /hdc160GB/admin/chander/startmarch07v21.pst Tue Jan 1 15:14:14 2008
2706 DENY_NONE 0x1 RDONLY EXCLUSIVE+BATCH /hdc160GB/programmers/projects/arts/information/dummy collection/Images/5.jpg Tue Jan 1 15:21:55 2008
5670 DENY_WRITE 0x3 RDWR EXCLUSIVE+BATCH /hdc160GB/admin/chander/startsept07.pst Tue Jan 1 15:10:01 2008
4732 DENY_WRITE 0x3 RDWR EXCLUSIVE+BATCH /hdc160GB/admin/accounts/bank account - PLS.sxc Tue Jan 1 15:12:57 2008
[root@server root]#
I have created some users on the samba server,the same username and password the windows users are using to acces Samba.
But,Some of the windows users are not able to perform write actions on files on the Samba server,Windows is showing 'Access Denied' message ,
Can u give any solution why Samba is showing
Unknown parameter encountered: "valid user"
Ignoring unknown parameter "valid user" ?
And some windows users are not able to perform write operations on the files on samba server ?
Please help me, it is very very urgent and required.!!!!!!!!!!!!