Mod says incorrect install upon join, downloading from repository. What did I do wrong?

I tried to add my first UI mod to the server. Maps and cars have all worked great. I was attempting to add this modded minimap ui app

Minimap | BeamNG

I installed it the same way as every other mod by dropping the zip in the appropriate server folder. I got an error message when I joined that it was installed incorrectly, and it was going to download from the repo instead. I then had to close beamng and relaunch to get it to show up. What did I do wrong, do I need to place this type of mod elsewhere?