'NoneType' is not callable when using local UV install for Perth watermarking

[sstpm]

When installing locally using UV sync on a runpod instance, the model fails to initialize because the Perth watermark library is not working.

The error trace:

INFO:     Waiting for application shutdown.
ERROR:asyncio:Task exception was never retrieved
future: <Task finished name='Task-3' coro=<initialize_model() done, defined at /workspace/chatterbox-tts-api/app/core/tts_model.py:27> exception=TypeError("'NoneType' object is not callable")>
Traceback (most recent call last):
  File "/workspace/chatterbox-tts-api/app/core/tts_model.py", line 97, in initialize_model
    raise e
  File "/workspace/chatterbox-tts-api/app/core/tts_model.py", line 81, in initialize_model
    _model = await loop.run_in_executor(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/chatterbox-tts-api/app/core/tts_model.py", line 83, in <lambda>
    lambda: ChatterboxTTS.from_pretrained(device=_device)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/chatterbox-tts-api/.venv/lib/python3.11/site-packages/chatterbox/tts.py", line 180, in from_pretrained
    return cls.from_local(Path(local_path).parent, device)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/chatterbox-tts-api/.venv/lib/python3.11/site-packages/chatterbox/tts.py", line 165, in from_local
    return cls(t3, s3gen, ve, tokenizer, device, conds=conds)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/chatterbox-tts-api/.venv/lib/python3.11/site-packages/chatterbox/tts.py", line 126, in __init__
    self.watermarker = perth.PerthImplicitWatermarker()
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not callable

[noobmldude]

Is there any solution or workaround for this?