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That's very interesting. It appears that Startech device uses the Eltima drivers. There might be some sort of version incompatibility.
BTW, the error message means that there are too many outstanding commands queued, probably because the Eltima drivers are broken/ incompatible.
From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Mike C
Sent: Thursday, October 21, 2021 10:06 AM
Subject: Re: [ap-gto] APCC error: "FindFeeQacIndex:no free entries!"
I once tried quite hard to get a StarTech Ethernet to Serial converter working to run my APCC from. After it
became clear that I would never get rid of comm packets getting lost occasionally, I ditched it and went back to
a hard wired connection. However, once the StarTech drivers were installed on the PC, a re-install of APCC
would never work again, the virtual serial ports would never function, and it would get exactly that QacIndex
error. I believe that error is from the virtual serial port software saying it can't do something.
I removed every piece of software related to the StarTech drivers I could find, but the QacIndex error
continued. I wrote AP for technical assistance. George taught me to look in the device manager for hidden
devices. There were some, I removed them and checked their file names and removed all those files manually.
The QacIndex errors continued.
In the end I wiped the PC, reinstalled Win10 and APCC immediately installed and I never saw the error again.