今天我做React開發時，遇到如下的錯誤消息：

Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:

You might have mismatching versions of React and the renderer (such as React DOM)

You might be breaking the Rules of Hooks

You might have more than one copy of React in the same app
See https://fb.me/react-invalid-hook-call for tips about how to debug and fix this problem.

這個錯誤輸出已經提醒了我，出錯誤的代碼在我的應用程序MyApp.jsx里：

原來是我這段const變量初始化代碼寫到function外部了：

將其移至內部后錯誤消失：

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