You have to restore a Time Machine backup. You need to load your Mac in safe mode. 
You want to format your startup disk and reinstall macOS. Your startup disk (the disk that loads your operating system) is corrupted. Here are some of the situations where it’s useful: Mac OS Recovery Mode special state where the operating system gives you access to native recovery tools such as Time Machine, Disk Utility, Terminal, and more. This article is a simple but in-depth guide about Recovery Mode, its native utilities, and recovering data. 
However, not all users are familiar with Recovery Mode as a MacBook rarely gets damaged to a point where you need to use it. Mac’s Recovery Mode is a native feature that lets you access powerful recovery tools that can help you repair your MacBook, preempt data corruption and data loss, completely erase a drive for a clean installation, restore backups, and more.
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