Identify the error in this sentence: I unlocked the unlock door.
I unlocked the unlock door.
The sentence contains a redundancy error as 'unlocked' and 'unlock' are used in the same sentence.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Identify the error in this sentence: I unlocked the unlock door.

### Response:
The sentence contains a redundancy error as 'unlocked' and 'unlock' are used in the same sentence.