This is a reference entry from React error codes. A full explanation with fixes has not been written yet.
A React Element from an older version of React was rendered. This is not supported. It can happen if: - Multiple copies of the "react" package is used. - A library pre-bundled an old copy of "react" or "react/jsx-runtime". - A compiler tries to "inline" JSX instead of using the runtime.
%s is filled in by React at runtime.
- Category
- Minified React error
- Severity
- error
- Runtime
- both
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Source: React error codes. Data fetched 2026-09-25T01:43:12.929Z.