Turn the machine off first and unplug.
If you've got a manual, look up the page for trouble shooting, this error message may be listed iwth a solution. I'd also suggest that you remove and clean out the bobbin holder. This is the little black piece you put the bobbin into. It has possibly dislodged if you've had a jam up. You will need to unscrew the two screws holding the needle plate down, take out the needle and pressure foot to give yourself some room too. Put the bobbin holder back into position lining up the red markings on the holder and the stopper, your manual should show images of this.
Once its all back together, turn on and hopefully it will reset to normal mode.
If you've done all this and the error message won't stop showing, then yes, you'll need to take it in for a service.
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