NANOVNA Saver

[KB7GP]

This program has been working. Now, it won't start, with the errors:

Traceback (most recent call last):
File "nanovna-saver.py", line 37, in
File "NanoVNASaver_main_.py", line 98, in main
File "NanoVNASaver\NanoVNASaver.py", line 129, in init
File "NanoVNASaver\Controls\SerialControl.py", line 37, in init
File "NanoVNASaver\Controls\SerialControl.py", line 68, in rescanSerialPort
File "NanoVNASaver\Hardware\Hardware.py", line 116, in get_interfaces
File "serial\serialwin32.py", line 64, in open
serial.serialutil.SerialException: could not open port 'COM4': PermissionError(13, 'Access is denied.', None, 5)
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I receive the same error when I have my NANOVNA unplugged from the computer.
Ideas?

DaveR KB7GP