AttributeError: 'NoneType' object has no attribute 'pipeline'

Hello,

I ran the GUI and, in inference mode, selected an index file of a pretrained model and the path of the audio file to be processed. But I run into the following error:

2023-10-19 09:33:29 | WARNING | infer.modules.vc.modules | Traceback (most recent call last):
  File "/home/jupyter/Retrieval-based-Voice-Conversion-WebUI/infer/modules/vc/modules.py", line 185, in vc_single
    audio_opt = self.pipeline.pipeline(
AttributeError: 'NoneType' object has no attribute 'pipeline'

Traceback (most recent call last):
  File "/opt/conda/lib/python3.10/site-packages/gradio/routes.py", line 437, in run_predict
    output = await app.get_blocks().process_api(
  File "/opt/conda/lib/python3.10/site-packages/gradio/blocks.py", line 1349, in process_api
    data = self.postprocess_data(fn_index, result["prediction"], state)
  File "/opt/conda/lib/python3.10/site-packages/gradio/blocks.py", line 1283, in postprocess_data
    prediction_value = block.postprocess(prediction_value)
  File "/opt/conda/lib/python3.10/site-packages/gradio/components.py", line 2586, in postprocess
    file_path = self.audio_to_temp_file(
  File "/opt/conda/lib/python3.10/site-packages/gradio/components.py", line 360, in audio_to_temp_file
    temp_dir = Path(dir) / self.hash_bytes(data.tobytes())
AttributeError: 'NoneType' object has no attribute 'tobytes'```

Another question, don't I have to input a pth file also?

Thanks,
Kevin

Start in infer/modules/vc/modules.py at vc_single line 185 and trace how self.pipeline is initialized before the GUI inference call. Reproduce the index-and-audio workflow, clarify whether a pth file is required from the issue context, and consider the issue done when inference no longer reaches a None pipeline for the documented inputs.