It's weird because the error log you posted doesn't mention any errors to do with Gearbox. It merely says that the file is being loaded. All the errors are with GodComplex.
However, if you are running gearbox-0.7.3.pk3, as the log states, it was updated to be compatible with GZDoom 4.14. 0.7.3 isn't expected to work with GZDoom versions older than 4.14. See my post near the top of the previous page. In fact, it wouldn't surprise me if GodComplex isn't working with the newer GZDooms for the same reasons.
GodComplex certainly needs a lot of tidying up. There are far too many warning and errors. It's not surprising that it broke really.
However, you could give an older version of Gearbox a go to see if you can get it working with the version of GZDoom that does work with GodComplex. https://github.com/mmaulwurff/gearbox/releases
Also, if it's any help, it is possible to load all the GodComplex files into UZDoom and get it to run with the following exceptions: either of the two files beginning with 9 and the file beginning with 10. Those files will cause the game to crash. All other files can be loaded, but some of them do print repeated errors to the console and screen.
[minimod][v0.7.3] Gearbox - weapon/inventory handling
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The Projects forums are only for projects. If you are asking questions about a project, either find that project's thread, or start a thread in the General section instead.
Got a cool project idea but nothing else? Put it in the project ideas thread instead!
Projects for any Doom-based engine (especially 3DGE) are perfectly acceptable here too.
Please read the full rules for more details.