Attempt Number: 4
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The last action taken was moving the robot left from tile_1-4 to tile_1-3. According to the logical conclusions, if the last action was a move, the next step should be to change the color of the paint gun. Since the robot is currently holding white, and the goal state requires the next tile (tile_0-4) to be black, the best action now is to change the color from white to black.

New State Description:
Robot1 is on tile_1-3 and has changed its paint gun color from white to black.

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