Generally, this is because the needle
is inserted wrong or because it's bent. In the first case, the top
of the needle (called the shank) has a flat side-this has to be
inserted so it faces the back or away from you.
In the second
case, when a bent needle stops the top thread from picking up the
bobbin thread. Even if you think your needle is fine, change it to
see if this solves the problem.
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