I sunk 4 Polish ships,but it still shows Invasion of Poland objctive incomplete when exit to the main menu .Why?

I sunk a battleship (Queen) in Norways teritorial water,and over 5 British ships in Narvik teritorial water,it still shows Operation Weserubun objective incomplete
I return to base at June 04 ,1940,and can't get any new objective,can't get to the next campaign.

Anyone else have this problem and know what I can do?