BlockUnknownError: raised by FileReadBlock with message: HTTP 404 Error: Not Found, Body: 404: Not Found. block_id: 3735a31f-7e18-4aca-9e90-08a7120674bc

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That error is basically AutoGPT tried to read a file block by ID, asked the server for it, and the server replied “404 Not Found.” So the block reference exists somewhere (in a run record / plan / agent graph), but the actual stored object isn’t available at the URL/service it’s trying to fetch from.