There is a motor underneath the oven that turns the plastic coupling the plate fits over. Either the motor has gone bad or the plastic coupling has cracked where it fits over the motor shaft. According to the Sears parts website (www.searspartsdirect.com), the plastic coupling (Emerson part # M0R0688) has been discontinued with no replacement. The motor is part # M0S1033 at $36.99.
You can continue using the oven even if the plate doesn't turn, but you have to occasionally open the oven and turn the food yourself to aid in even cooking.
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