Outbound registration not working?

The sems.conf that I’m using is the one at SEMS node installation — Yeti documentation

But I see that some users got other options, for example, in this thread (How to route calls - #6 by EAfang) there seems to be another configuration settings related to registration:

module “yeti”

registrar {
enabled = true
redis {
host = 127.0.0.1
port = 6379
}
}

I’ve added that to my sems.conf but it won’t start ( 1748556272.155541 [#ffffffffc1a1f000/148789] [cfg_reader_error, yeti:yeti.cpp:58] ERROR: line:90 section ‘root’: no such option ‘registrar’ )

So, what I’m missing? why SEMS won’t try to register to my SIP trunk provider? it only connects when I call, and works without problems for outgoing calls… but I can’t call back to my PSTN number because the trunk isn’t registering.
Maybe I’m missing something on my sems.conf?? (I’m using the one at the installation docs, and I did the full install just today!)

regards!
Francisco.