Can you please attach your project and let us know which NET you want to find out.
If you take the cursor to the net on schematic,you can see the net label number.
For the errors,first verify you have any net with mentioned label,if you find no such net,then close the creator and do a system restart and then open the creator and give a build.
Update us with your observation
Look for a wire segment that is not connected to anything. Increase magnification of the schematic page to see the net.
Finally,I created a new project and copied all components one by one.Now it works.