The VLAN with the tag mentioned must be added to the STP domain before the STP tag can be configured for that tag.
You can add the vlan to STP using this command:
configure stpd <stpd> add vlan <vlan-name> ports <ports> <stp-mode>
In case you have vlan v100 with tag 100 and you want to add that to s0 the comand would be:
configure s0 add vlan v100 ports 1 dot1d (or any other mode).