Docker 出現 error during connect 錯誤的解決方法

一開啟 Docker 發現有錯誤訊息

error during connect: Get http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.39/version: open //./pipe/docker_engine: The system cannot find the file specified. In the default daemon configuration on Windows, the docker client must be run elevated to connect. This error may also indicate that the docker daemon is not running.

查了一下，發現 Docker 沒有開啟，重起一下就正常了。