Split Line

Hello:

I am having a probelm with the split line, i want to make a split line so after that i can make a "delete face" but when i do the split line, it says that

ErrorSplit Line10

The projected sketch does not split the selected faces.  It may not intersect the faces or be totally coincident with an edge on the face.

:s

someone can help me? thanks a lot!

SolidworksSketching