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

Action Reasoning:
The robot is currently at tile_1-0 and holding the white paint gun. According to the goal state, tile_0-0 should be painted black. Since the robot is holding the wrong color, the next logical step is to change the color of the paint gun from white to black. This will allow the robot to paint tile_0-0 with the correct color in the subsequent step.

New State Description:
Robot1 is now holding the black paint gun while still occupying tile_1-0. Tile_1-0 remains clear, and tile_0-0 is ready to be painted black.

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