Check out the bobbin under and see if it has all that it need..and if the thread is in the right place on it ..Also check the needle to be in range ..and not shorter..(from the adjusting screw...sometimes if it is not tided well and you use some thick material ...it can move inside and being shorter it will not get to loop with the under thread ..
If you have the instructions just check it again to see how you thread it ..cause you might missed something ...
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