Finetuning Wav2Vec2 for ASR notebook doesn't work

Hi I was looking through colab notebook of this blog post and I got this RuntimeError: Error opening <fsspec.implementations.local.LocalFileOpener object at 0x7fd36e6e5dd0>: File contains data in an unknown format. calling prepare_dataset function
It happens every time I try to call dataset object containing audio column. In the past calling timit["train"][0]["audio"] would return dictionary with array, sampling rate, and file path now it is this runtime error.
What can I do about it??