Not authorized for PropertyWrite

I used kafka, but when I assign a value to a property, there's an error:com.thingworx.common.exceptions.InvalidRequestException: Not authorized for PropertyWrite on strvalue in TestReceiver

@ThingworxPropertyDefinitions(properties = {

@ThingworxPropertyDefinition(name = "strvalue", description = "", category = "", baseType = "STRING", aspects = {"isReadOnly:false","isPersistent:true"}) })

setPropertyValue("strvalue", new StringPrimitive(results));

Please help me solve this problem.