When an agent uses Redis as a checkpointer, does it not support the call of the astream method?

[WangXL1024]

checkpointer = RedisSaver("redis://localhost:6379")
agent= create_react_agent(
model,
tools=[get_weather],
checkpointer=checkpointer,
prompt=SYSTEM_INSTRUCTION
)
When I use agent.astream(inputs, config, stream_mode='messages'), an exception is thrown and it cannot work properly.
There will be no problem if RedisSaver is changed to MemorySaver.

[C00lway]

I think you need to use asynchronous checkpointer when using astream, have you tried AsyncRedisSaver?
What is the expection?