Attempt Number: 3
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The robot is currently holding the white paint gun and is positioned at tile_1-1. The tile directly above, tile_0-1, is not painted and should be painted white according to the goal state. The previous action was a color change, so the next logical step is to paint the tile above. This action will bring us closer to the goal state by correctly painting tile_0-1 white.

New State Description:
Tile_0-1 is now painted white. Robot1 remains on tile_1-1, holding the white paint gun. Tile_0-1 is no longer clear, as it is now painted.

Action Chosen:
paint-up(robot1, tile_0-1, tile_1-1, white)
