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

Action Reasoning:
The last action taken was "paint-up," which means the next step should be to move the robot horizontally if there are unpainted tiles in the row above. Since the robot is currently at tile_1-4 and the row above (row 0) has an unpainted tile (tile_0-4 should be black), the robot should change its paint gun color to black to match the goal state for tile_0-4. This aligns with the rule that after a move, the robot should change the color of the paint gun.

New State Description:
Robot1, located on tile_1-4, changes its paint gun color from white to black.

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