SkinnedMeshRenderer problem

hello im a new user in unity3d and i have a prbolem when import my fbx model from blender and put in the hierarchy it writes down: “SkinnedMeshRenderer requires a mesh with skinning information” why?? (im not an english speaker)

actually nevermind i managed to fix it thnx for help anyway

well i noticed that besides the character mesh there was another mesh but it was empty there was now object/model so i deleted it and it solved me the problem

in blender there was a mesh that had no object so i just erased it and it fixed that problem