I've built a 2D shape by tweaking a heavily subdivided plane, and I want to create an 'outline' of it by using the Skin modifier. To avoid having all the internal lines also get thickened by the Skin modifier, I added a Decimate modifier (set to Planar, other modifier's values left on defaults) to turn it all into one large face. The Skin modifier now no longer works, error message stating
No valid root vertex (you need one per mesh you want to skin)".
Is there anything I can do to combine the two modifiers?
Using blender 2.77a