What is the problem with Samba service configuration?

What is the problem with Samba service configuration? -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. I am using fedora core linux 5. When I use the testparm command to check the samba service, there is always a WARNING: passdb expand explicit = yes is deprecated sentence. What should I do, thank you for your advice.

Load smb config files from/etc/samba/smb. conf
Processing section "[homes]"
Processing section "[printers]"
Processing section "[wode]"
Loaded services file OK.
WARNING: passdb expand explicit = yes is deprecated
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions
[Global]
Netbios name = LINUX
Server string = Samba Server
Username map =/etc/samba/smbusers
Log file =/var/log/samba/% m. log
Max log size = 50
Socket options = TCP_NODELAY SO_RCVBUF = 8192 SO_SNDBUF = 8192
Printcap name =/etc/printcap
Dns proxy = No
Cups options = raw

[Homes]
Comment = Home Directories
Read only = No
Browseable = No

[Printers]
Comment = All Printers
Path =/var/spool/samba
Printable = Yes
Browseable = No

[Wode]
Comment = samba server
Path =/home/samba
Write list = fuchen
Read only = No