Trace image does not work any more

Hello all
i am new to Light burn. I want to convert a very simple pencil sketch into a path for laser cutting. For the first two sketches it work very well. But know it does not work any more. When i import the jpeg.file (scanned sketch) an click on Path - trace image, nothing happens. Also with the sketches some minutes before, Can anybody tell me, what is wrong now
Thanks in advance

Is the option grayed out?
Is the image selected?


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