Ore Eraser Planner (and all the others like upgrade planner etc) that have a "planner" object has an issue when picker extended is enabled. If enabled you can't craft these "planner" gizmos. If you temporarily disable picker extended you can craft them. Then save/exit/re-enable picker/load and voila they work great. You just can't craft the gizmos.
I should mention, factorio is WAY nicer with this mod. Keep assimilating.