I had a very long session with Teamviewer with another user that had exactly the same error code as you and, the issue was he had a very old version of SODE, 1.4.2, one that we never used in GSX (it probably came with some non-FSDT scenery), and this installation was corrupted, so it wasn't possible to update it with the version used by GSX ( 1.6.3 ).
In addition to that, no registry keys for SODE existed, so it was clearly an abnormal situation, and it caused Coautl to crash when checking a non-existent key. We fixed this in today's update, so Couatl won't crash anymore but, you still must fix the problem with SODE, otherwise GSX still won't work with jetways.
The solution was to follow the troubleshooting on SODE website:
https://sode.12bpilot.ch/?topic=faqSee the 3 Options listed in the "Installer Error" paragraph. In our case, the only one that worked was Option 3: using the "Microsoft Installation Fixer Tool", which allowed me to Unisntall SODE 1.4.2, so the latest 1.6.3 could be installed.