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firstly check that the needle is in the right way, flat shank to the back. This is easy to get wrong and will prevent the rotary hook from catching the upper thread when the needle is at the lowest point in the stitch sequence.
Also check threading up of the top thread, particularly that the thread is through the take up lever.
However, if you are certain threading up is correct, and needle is correct then the timing between needle and rotary hook may be out. There is diagrams at this website too for this problem http://www.sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Hook%20Timing.htm however, I've always left timing repair to my sewing machine technician to deal with.
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