What's wrong with React?

Question

React

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

7 | let state = store.getState()
   8 | 
>  9 | ReactDOM.render(
  10 |   <React.StrictMode>
  11 |     <React.Provider state={state}>
  12 |       <App />

Answer 1

The React.Provider component doesn't exist, where did you get it from? This is the exported type.

Answer 2

If this is translated literally:

Error: Element type is invalid: Expected string (for built-in components) or class/function (for composite components), but received: undefined. Most likely, you forgot to export your component from the file it is defined in, or you may have confused the default import with the named import.

And to fix it, you can try the following:

• disable `React.StrictMode` (remove corresponding tag or comment out)
  
• check `export` of all your components