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

Action Reasoning:
The last action taken was a move to the right, placing Robot1 on tile_1-4. According to the logical conclusions provided, after a move action, the next step should be to change the color of the paint gun. This is necessary because the next tile to be painted (tile_0-4) requires a different color than the one currently held. The goal state requires tile_0-4 to be painted black, so Robot1 needs to change its paint gun color from white to black.

New State Description:
Robot1, now on tile_1-4, changes its paint gun color from white to black, preparing to paint the tile above it, tile_0-4, in the next step.

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