groovy.lang.MissingMethodException

Every couple of minutes my logs are showing this message:

groovy.lang.MissingMethodException: No signature of method: genericZigbeeBulb.heartbeat() is applicable for argument types: () values: [] (heartbeat)

It's being logged for one of my zigbee bulbs. I have three others of the same model and none of them are logging this message.

What does this mean?