Gerber file import in CST

Hi,
I have a Gerber file and I want to import it in CST. When I select 2D/EDA Files import in Import/Export menu, the Gerber button is light grey meaning that i can not use it.
I somehow have a feeling that I need to select the 2D cordinate system in 3D environment in order to activate the Gerber import but I dont know how to do it.
Any help would be much appreciated.
Best Regards,
Rabia

Some years ago, some of the 2D import options required a separate (optional) license. I don't know if Gerber is a standard feature, or requires a license option.

yes it needed a separate license