I have recently installed clean builds of both Grafana and Influxdb. I am collecting data from around 20 sensors via mosquitto/node-red into a series of tables into an Influxdb - mydb.
This is a vanilla installation with no changes made from the default installation. The data is definitely arriving and being stored in the tables. I can pull it out via a simple command line query.
When I point Grafana (Again a vanilla build) at the DB, all queries result in the error message above
I have tried adding a non-default retention policy - this has not changed the situation
Constructive advice gratefully received.