How to add Plane to rectify the "Missing Plane" Error?

Hello all,

I created a tapered spring (Sweep 5) using Plane 1 (created using the Reference Geometry option) as the reference plane. Later unknowingly I deleted Plane 1 and saved the file. Now whenever I try to work on the same, I get an error, as shown below.

As it suggests, I created a new plane, Plane 2 to add the reference plane.

But, when I click on the "Edit Sketch Plane" command to add Plane 2, I am not able to select Plane 2 (shown Below)

Can someone help me in overcoming this?

Thanks

SolidworksParts And Features