Schematic symbol pin name. OrCAD 16.3

Hello everyone,

I'm new here and also new to Cadence OrCAD capture.

I'm currently used OrCAD16.3 to build schematic symbol and have the error as the picture below everytime I trave to save or close it.

Is OrCAD required all the pin name have to be different even GND, VCC, NC, and DNU?

 Thank you very much