Question on cst errors

I am trying to simulate a power Wilkinson Divider on CST.
I am using discrete ports to feed it.
However I am getting the following error:
Face element touches electric boundary at xmin
Which means that I need to change the dimensions of my boundary box.
How do I do that?
Thanks

Select boundaries under Simulation tab

Hmm sorry seems like an accidental/incomplete post on my part. After selecting boundaries, set the planes to either "open" or "open add space" application dependent. Seems like current configuration is set to Et=0 at the moment and that is giving you the error. (Unless of course that is exactly what you intended to do, then we'll have to look more into this problem )