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This is most commonly caused by white-space inserted around server-rendered markup. Render methods should be a pure function of props and state; triggering nested component updates from render is not allowed. If necessary, trigger nested updates in componentDidUpdate. Target container is not a DOM element. The node you're attempting to unmount was rendered by another copy of React. The node you're attempting to unmount was rendered by React and is not a top-level container.
Target container is not valid. This usually means you rendered a different component type or props on the client from the one on the server, or your render methods are impure.
React cannot handle this case due to cross-browser quirks by rendering at the document root. You should look for environment dependent code in your components and ensure the props are the same client and server side: This generally means that you are using server rendering and the markup generated on the server was not what the client was expecting.