error CS0246: The type or namespace name `UnityEditor' could not be found. Are you missing a using directive or an assembly reference?

I have this probelm Assets/EasyRoads3D Free/scripts/SideObjectInit.cs(2,7): error CS0246: The type or namespace name `UnityEditor’ could not be found. Are you missing a using directive or an assembly reference? when i try to building game for android
Unity say that there is problem in the line unity ediotr but i dont know how to resolve it

I simply export files from the disk d(sideobjectint.cs) to other disk and all was fine