_processChildContext is not available in React 16+

[mech]

Is the release candidate version of React 16 support on v3.3.0-alpha.0? Using React 16.0.0-rc.3, I am getting this react-modal error:

_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).

[danielduan]

There shouldn't be anything preventing React 16 from working. I wonder if you have 2 different versions of react installed?

[mech]

I just perform a new app using the following and got the same error. I suspect is react-modal.

▶ create-react-app demo-app
▶ yarn add react@next react-dom@next
▶ getstorybook
▶ yarn run storybook

Visit the browser console give me these:

[Hypnosphi]

@mech that's weird, I followed the reproduction instructions and I don't get those errors even after opening some modals. Can you please upload the project you get to GitHub as a repo?

[mech]

You are right, I go to my 2nd laptop and try to use React 16.0.0-rc.3 with create-react-app and it worked fine. Sorry for that, I am surprised my main machine got issues.

[brycehill]

Hmm, I'm running into this too. Not sure why yet.

[mech]

Try making sure your yarn or NPM is latest version. When I upgrade my yarn from 0.x to 1.x, it works.

[dumbNickname]

In my case rebuilding the lock file from scratch helped - I removed node_modules together with yarn.lock file and re-installed all of the dependencies. Maybe it helps somebody.

[faherrera]

I have the same problem when I want to use to Modals from 'react-materialize'. And this project have all update. I really need this component. If you can help me, I will be thank

[ArturKwiatkowski]

Guys I had this issue and it's gone now after I upgraded my yarn to 1.1.0

[bringking]

@Fowowski's fix worked for us!

[enejka]

I had the same issue. It was caused by react-modal ( used by storybook). React-modal installed its own old version of react. Removing node_modules direcory from react-modal package solves the problem.