I tried the code that you posted. The results were:
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No error message
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So i had 2 monitors open. One was monitoring "Serial"(USB) and the other was monitoring "Serial1". When i type into "Serial" it turned the LED on and off the way it was supposed to. and the "Serial1" monitor would also echo back whatever i typed with absolutely no problems. however when i type into "Serial1" nothing happens to the LED and Nothing is echoed back on the "Serial" monitor