Attempt Number: 4
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
Block C is the base of the goal stack, and everything else needs to be stacked on top of it. Pick up block D so it can be stacked first.

New State Description:
Block A is on the table and clear. Block B is on the table and clear. Block C is on the table and clear. Block D is held by the hand and not clear. The hand is holding block D.

Action Chosen:
pick-up(block_d)
