This component return an error when post annotation but work correctly

[stuxboulot]

When i use this component, i have this error

./grafana-annotation -config-file ~/.grafana-anotation-poster.yml -data testjio -what "blabla" -tag test
grafana-annotation 2019/04/08 11:10:03 [INFO] ▶ response Status:200 OK
grafana-annotation 2019/04/08 11:10:03 [INFO] ▶ response Headers:map[Content-Type:[application/json] Date:[Mon, 08 Apr 2019 09:11:46 GMT] Content-Length:[39]]
grafana-annotation 2019/04/08 11:10:03 [**CRIT**] ▶ **error sending annotation. Message is Graphite annotation added**

But the annotation is present on grafana.

[vfoucault]

This issue seems to come from grafana 4. Do you have any example payload that I can check what is going on ?