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I'm trying to improve error handling for my app, so I've create a very simple component ErrorComponet.jsx:

import React from "react";

const ErrorComponent = (props) => {
  return (<pre>{JSON.stringify(props, null, 1)}</pre>);
};

export default ErrorComponent;

Then inside layout i use that on the placeholder:

<Placeholder name="jss-hero" rendering={route} errorComponent={ErrorComponent} />

But when I run the application I get a warning

index.js:1 Warning: Failed prop type: Invalid prop `errorComponent` supplied to `PlaceholderComponent`.
    in PlaceholderComponent (created by Context.Consumer)
    in WithComponentFactory (at Layout.js:26)
    in main (at Layout.js:25)
    in Layout (at RouteHandler.js:183)
    in RouteHandler (at AppRoot.js:27)
    in Route (at AppRoot.js:35)
    in Switch (at AppRoot.js:33)
    in Router (created by BrowserRouter)
    in BrowserRouter (at AppRoot.js:32)
    in SitecoreContext (at AppRoot.js:31)
    in ApolloProvider (at AppRoot.js:30)
    in ErrorBoundary (at AppRoot.js:29)
    in AppRoot (at src/index.js:70)

What can I do to get rid of this warning?

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