My friend can’t join our world after ”bedrock”-update 

Hi i updated recently my ps4 world to beedrock edition and now my friend can't join me, on the same world that we had no problems before on. So i have tried to search on google for solutions but found nothing. how do i solve this problem?

We both have playstation4 and playstation plus, and as I said there was no problems playing in the same world togheter, before the Bedrock update. Whist to do?