Solved Can't assign the same material to multiple objects in Blender?

I've noticed that some meshes in my mod utilize a nonexistent "legran_engine.002" material. I tried to rename the material, but the normal "legran_engine" material on another mesh instantly changed to "legran_engine.002". What should I do to make them all have proper material?

 

Select the material from the drop-down menu in the material tab.