Why is my sketch not a closed contour?

Hi,

I'm looking to use the two sketches in the attached file to make a feature using Revolved Boss/Base. However, I'm unable to do so, I'm assuming because my sketch "SKETCH Rev Features" isn't showing up as a closed contour.

It has every appearance, to my knowledge, of a closed contour.

Does anyone have any ideas?

Thanks in advance !

SolidworksModeling And Assemblies