I am not able to sew with the machine and cannot figure out why. Every time is try to sew, the thread immediately comes out of the needle (but remains in the fabric). I have rethreaded about 20 times, redone the bobbins and just do not what to do now. I need the machine to turn up some curtains for the room my son and his partner are coming to stay in tomorrow - so help is needed now please. Any ideas?