Hi Annie, It all has to do with your foot pedal. CHECK to make sure it's plugged into your machine properly.
IF it jiggles around in the socket, wrap a bit of tape around the rubber/plastic part that goes into the socket. I had to do that with one of my machines about a month after I got it...that was 10 years ago, still works great.
If these things don't work, then you may need a new foot pedal, or a new socket...or both.
THE link below will take you right to the page in the manual that explains the error. I hope the tape works for you:)
https://www.manualslib.com/manual/1266781/Brother-Nv-10a.html?page=183#manual
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