Invalid zip file

I recently setup a fresh server and wanted to add in the uj_base_1033 mod to my server to customize it. And no matter what I do when I join the server I get this error. It is installed correctly as per the instructions.


Just to tripple check, you are putting the mod in this location?
(please note the ‘Server3-Spa’ is the name of the folder with my server in it, yours will likely be ‘BeamMP server’).
Then joining with a BeamMP client that only has multiplayer enabled.