So, I added a kit called "VIP Gold". If I type in chat /kit "VIP Gold" I receive the kit, but if I go to the kits gui and press redeem on the VIP Gold, it says that the kit does not exist.
Is there a way to fix that?

Rename the kit to "VIPGold."

Is there a way to keep the name with the spaces?

You can use - between the words to keep it a complete "word", Its the way the plugin works and you will find the same problem the NTeleportation as you cannot have 2 word /sethomes . Why not try VIP1, ViP2 etc ?

create your Kit, how u need it. if finish, unload plugin Kits, navigate now to oxide/data/Kits.json make always a copy/Backup, open it, search your Kit, now u find there name: “here you can Name it with spaces“ or you can use inside color code. Now save it, load/reload plugin Kits, and have fun :)

Thank you! I just had to change the kit name to a no space name in data/Kits.json and data/Kits_Data.json, but I could keep the display name with spaces.
Thanks!