No NSORT data is available for the selected set

[Settler]

Hi all,

When I want to isolate some nodes from my model I do:

NSEL,S,LOC,Z,ZMIN,ZMAX
NSEL,R,LOC,X,XMIN,XMAX
NSEL,R,LOC,Y,XMIN,XMAX
NSORT,S,X

in order to later use the *GET command.

However, some times I run to the following error message:

"No NSORT data is available for the selected set"

Does anyone know where this is comming from?

Thanks!