This is a reference entry from React error codes. A full explanation with fixes has not been written yet.
_processChildContext is not available in React 16+. This likely means you have multiple copies of React and are attempting to nest a React 15 tree inside a React 16 tree using unstable_renderSubtreeIntoContainer, which isn't supported. Try to make sure you have only one copy of React (and ideally, switch to ReactDOM.unstable_createPortal).
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Source: React error codes. Data fetched 2026-09-25T01:43:12.927Z.