react cannot read property usecontext of null
The error "Cannot read property 'useContext' of null" in React usually occurs when you try to use the useContext hook within a component that is not properly wrapped in a Context Provider.
To fix this issue, you need to make sure that the component where you are using the useContext hook is wrapped inside a Context Provider.
Here's an example of how to use the useContext hook correctly:
```jsx
import React, { useContext } from 'react';
react to 结构const MyContext = ateContext();
const MyComponent = () => {
  const value = useContext(MyContext); // Using the useContext hook
  return (
    <div>
      {/* Use the value from the context */}
      <h1>{value}</h1>
    </div>
  );
};
const MyApp = () => {
  return (
    <MyContext.Provider value={'Hello World'}>
      <MyComponent />
    </MyContext.Provider>
  );
};
export default MyApp;
```
In this example, `<MyComponent />` is wrapped inside the `<MyContext.Provider>`, which makes the `useContext` hook work correctly.
Make sure you have a similar structure in your code, where the component using the `useContext` hook is wrapped inside a Context Provider that provides the context values.

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