“The program is no longer open”: how to solve one of the errors macOS

One of the mistakes, which sometimes have Mac users — “Program xxx is no longer open”. Most often it occurs when working with applications Preview, Finder, Steam and many others. In fact, this kind of message “App not responding” on Windows. Why error occurs and how to get rid of it?

This message appears if the application is running but is not responding to user requests, while it remains in the dock system. The operating system itself believes that if the programme is not …
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