Describe the bug

When using the xtts-1 model on windows (python 3.11.6), every time I run the tts_to_file function, it gives the error TypeError: Invalid file: None

To Reproduce

On windows with python 3.11.6, with torch, torchaudio (not sure if needed, but just to be sure) and TTS installed, run this snippet

import torch
from TTS.api import TTS
tts = TTS("tts_models/multilingual/multi-dataset/xtts_v1").to("cuda" if toch.cuda.is_available() else "cpu")
# any combination of parameters gives the same error.
tts.tts_to_file("Hello, world!", language="en") # Expected error: "TypeError: Invalid file: None"

Expected behavior

The audio output should be written to output.wav, or the specified file name.

Logs

No response

Environment

- 🐸TTS Version: 0.17.8
- PyTorch Version: 2.1.0+cpu
- Python Version: 3.11.6
- OS: Windows 11
- CUDA/cuDNN version: null
- GPU models and configuration: AMD Ryzen 7 5700G with Radeon Graphics
- How you installed PyTorch: pip on a virtual environment

Additional context

No response