Hello 
This my Applicationlog 
But Error is not clear to me 
 
2019-11-08 11:57:16.351  Error Error Handling Publish Arrived for [heater/temp] : [null] System c.t.t.m.MQTTThing MQTT Call: /Thingworx//Teksun_thing    

Log Messages

Error Handling Publish Arrived for [heater/temp] : [null]