Should it be a runtime error? 8002? Invalid? $ number, that is to say, the introduction of the communication port is occupied by some software, which makes the wrong program unable to use this port.

Solution: You can try the network traffic monitoring function of 360 security guards, check and find the software that occupies the port, and then close the recovery (provided that you know what port number this software uses, try to see if it is in the settings or help of this software, and help it change the port number if it can be modified).