Page does not exist error when trying to create a Lead Nurturing agent

Hello,  

I am having challenges with creating a Lead Nurturing agent. First of all, the trailhead needs to be updated, as the new playground includes screenshots that are not identical. Anyway, when I tried to set up a lead nurturing agent. I get a "page does not exist error. I am also unable to disconnect the Trailhead playground and start a new playground . 

Userid : epic.1ade1779824160932