I cannot start adventure. What to do?

I do not have any ongoing adventures but game says I am on an adventure.
I can't do the guild quests where I need to do 2 adventures because of that.
What can I do?

check your quest log, sometimes the adventures do not show up on the right of the screen and you need to toggle them off and on in the quest log.

Like me, you need to wait for BB to fix it. Mine was caused by an error while trying to play one of the Xmas scenarios. Support told me to be patient ;)