i get an error like yours when i run the program with no cable connected. perhaps your drivers are wrong. here is a gui version if you would like to try for shits and giggles. it has version 1.31 and 1.4 in it. just run me7gui. sometimes i had troubles with the command line so i just use gui whenever i can
I have got an other error code when I use this tools without connection, I am pretty sure that my driver is ok, because the com port can be found in windows device management.
when I.try to connected a port that don't exist , it will appear other error code.