Hello,
I am new to proteus 8.13 and I have migrated a circuit design from DipTrace.
My new circuit has 3 boards (Arduino Uno - IR2130 based drive - IRF3205 based Mosfets) which will drive a 48 vdc BLDC motor.
I am getting ERC errors in the form of "SINGULAR LABEL:" for connections between the boards. Is this because I am using the same terminal connection format for single board components ?

 

you may get more responses if you include example of the problem in a format that more people can use (screenshot, PDF...)
if the boards are all separate projects, there should be no issues with signal names used in other designs.