Parent State ID: 53
State Depth: 7
Action Taken: paint-down(robot1, tile_2-1, tile_1-1, black)
Action Reasoning: Robot1 needs to paint tile_2-1 black, which is directly below its current position on tile_1-1 and is required for the goal state.
State Description: Tile tile_0-1 is clear. Tile tile_0-2 is clear. Tile tile_0-3 is clear. Tile tile_1-1 is occupied by robot1 holding color black. Tile tile_1-2 is clear. Tile tile_1-3 is clear. Tile tile_2-1 is painted black. Tile tile_2-2 is painted white. Tile tile_2-3 is painted black. Robot1 is on tile_1-1, holding color black. Colors white and black are available for switching.
Action Path: ['right(robot1, tile_0-1, tile_0-2)', 'down(robot1, tile_0-2, tile_1-2)', 'paint-down(robot1, tile_2-2, tile_1-2, white)', 'change-color(robot1, white, black)', 'paint-down(robot1, tile_2-3, tile_1-2, black)', 'left(robot1, tile_1-2, tile_1-1)', 'paint-down(robot1, tile_2-1, tile_1-1, black)']

INACTIVE REASON: action path invalid: The last action is invalid because the precondition that `tile_2-1` must be clear is not met; it is already painted. The current state's natural language description and visualization are accurate, but the action itself is not valid.
