Warning is a hint, but you can usually ignore it. The error is still a concern.
The question is why it went to refer to that file in the first place. And it is possible that the cache is simply corrupted.
On a completely different note, there were cases where Colab did not work properly, but there were no problems in local or HF Spaces. To me, it seemed that the HF cache was malfunctioning in Colab.