Error when viewing course


I just switch from full woocomerce (suibsrcription, sensei, membership) to your solution.
When I create a course and put it live I can't see it i get this kind of message :

Not Found

The requested URL /courses/non-scholae-sed-vitae-discimus/units/ was not found on this server.

Can you please help me.

Also is it possible to sell membership with Marketpress in order to get data on my customer ?