This is a reference entry from React error codes. A full explanation with fixes has not been written yet.
React doesn't accept base64 encoded file uploads because we don't except form data passed from a browser to ever encode data that way. If that's the wrong assumption, we can easily fix it.
%s is filled in by React at runtime.
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- Minified React error
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Source: React error codes. Data fetched 2026-09-25T01:43:12.929Z.