"Could'nt find a default importer for Content.mgcb"

I recently added textures to a Monogame Content folder, however i noticed i put them in a different folder then they were supposed to be in. So i copied them all and removed them from the content folder and into the new content folder which i originally intended to have my textures in. But the problem is it says “Could’nt find a default importer for Content.mgcb” whenever i try to run my game. Im new to monogame and i don’t really know what the problem might me.