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When in the course of editing, Hemlock is unable to do what it thinks you want to do, then it brings this to your attention by a beep or a screen flash (possibly accompanied by an explanatory echo area message such as "No next line.".) Although the exact attention-getting mechanism may vary on the output device and variable settings, this is always called beeping.
Whatever the circumstances, you had best try something else since Hemlock, being far more stupid than you, is far more stubborn. Hemlock is an extensible editor, so it is always possible to change the command that complained to do what you wanted it to do.