You try to connect a power or current measurement device (StaPqmea or StaImea) but you get the message: "Selected Object NodeName 'Terminal' is not a 'Cubicle'". You have to select in this case on the left side of the window the terminal. On the right side you will see then all cubicles which are connecting the different branch elements. Select now one of the cubicles.

See also the attached screenshot.