Dryer drum stopped rotating, dryer blower continues to work.

While drying a pair of tennis shoes the drum stopped rotating, it continues to blow warm air and and makes all the same sounds as it does when working but the drum does not turn. I have shut the unit off and restarted a drying cycle but it does not cause the drum to turn.

Is there a reset for the drum or did the clunking of the tennis shoes knock something loose....?

Any help would be very much appreciated.