command cerig errore nodo master

[IRE21]

Good morning to all,
I am new in apdl modeling and I came across wanting to apply the cerig command to connect a beam188 and a shell181.
the beam I defined it as a local system, while the shell is defined in the global default system.

The code I wrote is


"
Allsel,all,all
!cerig beam and shell
Csys,12!12 local system for the beam

Master node!
nodomaster=node(0,0,0)

Slaves!
csys,global !shell is defined in the global system
♪
nsel,s,loc,y,1740,1750

cerig,nodomaster,all,all
Allsel,all,all "

However it does not work, the resulting error message is "the independent node (node number) is undefined or unselected. the cerig command is ignored

but it is not clear to me why it should not be defined if it really is.
I've inserted some alls and allsel scattered just to select everything and don't miss anything but I don't understand how to make up for the reported herror.

I hope you can help me, thank you in advance.

 

[F_Ingrasciotta]

to activate the master node the beam188 must understand. You should understand a little what kind of problem you are trying to solve and how you implemented the beam and shell code.