Navy problem

[Haart]

First, someone was able to put a blockade on me, even though I still had some ships left (7 submarines, 8 carriers).

 

Then I decided to sell land so naval operations couldn't be performed, but now when I have slightly more than 1000 miles and try to click on the button I get an error message saying that I don't have land to sell.

[Therm]

1) submarines and carriers cannot break blockades

2) you are over 2000 days old and cannot fall under 1000 land

[Illidan Stormrage]

1) submarines and carriers cannot break blockades

2) you are over 2000 days old and cannot fall under 1000 land

This is correct on both counts.