Attempt Number: 2
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The last action taken was a move to the right, which means the next logical step is to change the color of the paint gun. The robot is currently holding black, but the next tile to be painted (tile_0-1) should be white according to the goal state. Therefore, the best action is to change the color from black to white.

New State Description:
Robot1 is now holding the white paint gun while standing on tile_1-1. Tile_1-0 is clear, and tile_1-1 is occupied by the robot. The robot is ready to paint the tile above it (tile_0-1) white.

Action Chosen:
change-color(robot1, black, white)
