CST VBA linking blocks

Hi to all

As part of a circuit set-up i'm trying to link a capacitor and a ground block by using these commands:

With Link
.Reset
.SetSourcePortFromBlockPort("CAP4","1",False)
.SetTargetPortFromBlockPort("GND9","1",False)
.Create
End With

Everytime CST says it's unable to access the Ground port.
Both blocks are yet unlinked to any other element and i tried every combination of True/False and Source/Target.
Please let me know what i'm doing wrong.

Thanks!