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.createPortal).
%s is filled in by React at runtime.
- Category
- Minified React error
- Severity
- error
- Runtime
- both
or press Cmd/Ctrl + Enter. The text is only sent to this site to match it.
Source: React error codes. Data fetched 2026-09-25T01:43:12.927Z.