Any misfunction spotted in the games should be posted here for revision. Taking advantage of any in-game bug can result in account termination. To avoid this, you have to post the bug you found here.
You are missing one of the resources. It should red out the exact missing resource. I am checking now to see if this is a general error or if this never happened anyway.
Probably you do not have the required space then. You will need to upgrade the mansion. You can check the available space there.
For example: Details:Available fields: 120 Occupied: 120 Empty Fields: 0
I am still investigating this. It does seem to be an issue preventing the display of error message, affecting private marinas only. I will post again once it is fixed.