The parting surface must be larger than the boundary of the sketch

Hello,

I'm trying to make a mold for the surface attached. I believe I'm close to finishing. I've been following Youtube tutorials. But once I get to the tooling split, I run an error that says: "the parting surface must be larger than the boundary of the sketch." Naturally, I've searched online for possible solution but none have helped so far.

File is attached , please help me out .

Thanks

Nasir

SolidworksEducator Student