This is a common issue with Ships in general. Its where the Ship cannot find the structure of your ship.
You can see what ships sees by using the following command
/Ships ship <ship id> track
There are a number of reasons why this happens, here are some common ones. 1) The ships structure is made out of blocks that arnt specified as materials in your blocklist 2) Your structure assumed Ships tracks blocks diagonally
Tell me how it goes
Edit: just seen you said licence sign.
This typically means your getting a error when booting saying that it could not load your ship. Try checking the position within the VesselData config and make sure it matches the licence sign.
Then where is the VesselData config located? I know you are generally busy at this time, do please reply later if you perhaps have time, this plugin is good but donāt let it take too much time from you*
I tried to find this location, I can find the file config and there is a file call Ships inside, but I can not find Vessel Data in it, the minecraft version is 1.12.2, and I am not sure if it is because of I did not find a sponge version of Ship Plugin at this Minecraft version to useā¦ I am really sorry I am having my exams near days, that makes me canāt reply you at the day you response, have to sorry againā¦