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

Action Reasoning:
To progress towards the goal state, we need to rearrange the cars such that each one ends up on the correct curb according to the goal. Moving car1 to the empty curb2 will facilitate organizing other cars because it frees up curb1 for car2, making future steps easier.

New State Description:
Curb_0: Contains car4, clear.Curb_1: Contains car2, clear.Curb_2: Contains car1, clear.Curb_3: Contains car3, clear.Curb_4: Contains car0, with car5 double parked behind it. Car0 is blocked; car5 is clear.Car0: Parked and blocked in curb4.Car1: Parked and clear in curb2.Car2: Parked and clear in curb1.Car3: Parked and clear in curb3.Car4: Parked and clear in curb0.Car5: Double parked, clear, behind car0 in curb4.

Action Chosen:
(move-car-to-curb car1 car2 curb2)
