Can you help me baking maps in substance please? (Blender/zbrush/Substance)

Hi! im trying blender and i have the next problem:

I did a Sword in blender, UVs, and basic materials for each object, and exported it as Espada_low.fbx, then imported the .obj off two parts in Zbrush to sculpt details, i saved that as Espada_high.fbx (with two objects inside, blade and guard).

I opened in Substance painter the Espada_low.fbx, but, when i try to bake the maps from Espada_high.fbx, anything happens. I dont know what the problem might be.

Any help would be awsome!