Two issues may be at play when you have difficulty extruding spritz dough from your press. The first may be that the dough is too cold. Let the dough stand at room temperature for about 10 minutes, then try pressing again.
If it still will not come out, remove the dough from the press, place it on your work surface, and knead it until it feels smooth and supple. The heat from your hands should soften it right up.