Grafana log full of mesage: Could not find plugin definition for data source: logging"

Hi i am using Grafana v6.5.2 (commit: 742d165).
And my log is full with this messages

t=2020-01-09T13:19:41-0600 lvl=eror msg=“Could not find plugin definition for data source: logging”

i was looking around for some fix or if there is something wrong in my configuration but i can´t find it.
Any one has the same error?