Xerox C 20 photocopier 'scanner blocked' eror message

There is a scanner lock located on the bottom of the scanner. Look where you take your copies out of the machine. On the under side of the scanner you will see a green latch about an inch and a half long and half inch wide.
Turn the machine off. push the scanner latch inward , then pull it back toward yourself until you hear and feel it snap into place. Then turn the machine back on. that should do it.