garbled text generation on Mac

[GPTLocalhost]

python3 -m fastchat.serve.cli --device mps --model-path lmsys/vicuna-7b-v1.5

The above command produces the following garbled text. What can I do? Thank you for any advcie.

USER: hello
ASSISTANT: We detected that you are passing past_key_values as a tuple of tuples. This is deprecated and will be removed in v4.47. Please convert your cache or use an appropriate Cache class (https://huggingface.co/docs/transformers/kv_cache#legacy-cache-format)
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