How are you writing the licence sign? As in line by line.

1. [Ships]
2. ?
3. ?
4. ?

Thats odd.
What version of Ships does it say when you do "/ships info" and what Minecraft version?

Ah that threw me, this is the github for Ships 6. As for ships 5. Have you modified any of the config file? Also does "Ship" appear after running the command "ships developer vesseltypes"?

thats really strange, it is installed, but giving that message. mind if you send me your server IP so I can see for myself?

got it, thanks

https://pastebin.com/U2Ctnqi5