N.I.N.A no longer able to connect to iOptron CEM120

I've run into a problem with N.I.N.A being able to connect to my iOptron CEM120.

I am using the latest firmware and drives from iOptron.

I've also tried all versions of N.I.N.A (Stable, Beta and Nightly build) all have the same problem.

I've also tried this on a separate Windows 10 computer with the same results.

iOptron ASCOM driver and Commander 6.3.3.1

Hand Controller Firmware v20210101

CEM120 Firmware v191120

The error I get is.

I haven't used N.I.N.A in awhile so I don't know what has caused it to break. It was working OK previously.

The iOptron commander itself is working and connects OK. I can control the mount in other software as well such as Sharpcap. So I tend to think the problem in related to N.I.N.A and the CEM120 specifically.

I also have a CEM40 and this is working with N.I.N.A. The firmware and ASCOM for the CEM40 are different as required by iOptron, so I don't know if the problem is with ASCOM, iOptron or N.I.N.A.

Doing a fresh install of N.I.N.A and also trying it on a different computer with many variations continually results in the error.

I have no idea what to do next or how to resolve this problem. Any suggestions would be welcome.

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