Singer Futura CE-250 "sewing machine error beep" Questions

...sewing machine beeps four time and won't let me sew When I try to plug in the foot pedal to my sewing machine it makes four beeping sounds and won't let me sew. Though when I move the needle up and ...

...machine. However, when I switch to sewing (turn off, change the arm thingy, switch tension to "S", unplug USB, plug in foot pedal, turn back on) it begins like normal but then the lines on ...