Updated influxdb to 3.0 and now no data shows

I just updated InfluxDB to 3.0 and my data is not showing up in influxdb anymore. I know so little about it, or even how to describe the problem, that I’m affraid this post won’t make sense. It was running fine before, data was showing up in influxdb and I had a dashboard created in grafana. When I updated to influxdb 3.0, no data appears in grafana, and when I go to influxdb and try to do a query, I get the following with the message “Your query is syntactically correct but returned no results”: