Can't make any boats in all cities

[Herod]

Hello , Europa barbarorum is a really good mod (the best) but , i have a problem (v. 0.74)

I play with Casse , i control all the UK and Ireland but the problem is : i can't make boat !... i have lost the beginning's boats then i can't moove from my isles , i'm in 210 BC and it become borring to can't make anything :s ( i can't upgrade my shipyards ).

Is it because my cities aren't enough big ( i have over 20000 citizen in few cities :s ) ? Or its a bug :s .

Thanks for helps :) (sry if its a recruitement problem but i'm not sure , and sry for my english which is not perfect :P ).