Unable to fine-tune GPT: "Error creating job: file-FACkxoMrLERsg11q6cBB9u does not exist"

I’m trying to fine-tune GPT as usual, but I’m getting this error:

I uploaded my JSON file via the website as normal when setting up the fine-tune. I clicked where it says “Browse files” and the file is there and it says “Ready”.

But no matter what, I get this red error saying the file does not exist, when I know the file does exist.

Having same problem here, did you found how to solve this?