It would help if you could make - and post the link to - a public project demonstrating this issue. Otherwise just guessing... * For each net, check that the netnames of the pads and the tracks connecting them are all the same (eyeball the PCB and use the Design manager to identify nets). * Is this PCB created from an EasyEDA Schematic in the same project folder? * Have you assigned netnames in the schematic?

@andyfierman Here is the link to this project. I have checked the net names, they are all the same. The PCB is created from an EasyEDA schematic in the same project folder, but it was updated a few times. Some net names are assigned, but some are not. [https://easyeda.com/ss4c0001/h-bridge-inverter_copy](https://easyeda.com/ss4c0001/h-bridge-inverter_copy)

@andyfierman I have figured the problem out. The two pads that are being connected has the same net name, but the track does not. It seems like when I updated the PCB, the net name of the tracks does not get updated. This needs to be fixed.