Invading England with fleet

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Hi guys, i just discovered M&B (Awesome game... My Hype for Bannerlords is really huge).
I 've experimented some problems on that mission, of joinning Sven and the others 's Fleet to invade Northumbria from Ribe port. 
I joined the fleet, then i lost it for a while.

Then i dont know what happens, but we re attacked by a massive amont of ships.  I can scape... And reach England land.  But game seems like broken.
Some Errors on screen and no Quest lines or nothing to go on. 

What is supossed to happens on that mission? 

Thanks and sorry possible bad english


Grandmaster Knight
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Are you playing 2.021? Could you re-try mission and tell us that red text you got?