AttributeError: 'MemuClient' object has no attribute 'chat'

[sazima]

from memu import MemuClient

# Initialize MemU client
memu_client = MemuClient(
    base_url="https://api.memu.so",
    api_key=api_key
)

# Verify connection
while True:
    user_input = input("User: ")

    response = memu_client.chat(
        user_id='test_user1',
        agent_id='test_agent1',
        message=user_input
    )
    print(f"Assistant: {response}")

I ran the example in the document (https://memu.pro/docs#responseapi), but I got an error

User: ddd
Traceback (most recent call last):
  File "/home/cent/test/aiiiiii/memu_helloworld.py", line 15, in <module>
    response = memu_client.chat(
               ^^^^^^^^^^^^^^^^
AttributeError: 'MemuClient' object has no attribute 'chat'