Problem with drawing stairs with sketch

[j.kozlikBV47Q]

Hey everyone! I am writing here as I do not really know why Revit is not enabling me to create such stairs:

Error: Invalid sketch, can't create run by this sketch.

Does anybody know the solution for this?

[barthbradley]

Have you placed the Stair Path before closing out? 

...screenshot what it the error message says under "Expand>>".  

...are all the Riser Lines touching a Boundary Line? Not another Riser Line?