Error: 400 Selected dimensions and metrics cannot be queried together

This Google Analytics API error indicates that the metrics and dimensions being requested cannot be used together. This usually happens when you are creating a custom report, and you added a combination of fields that the API rejects.

In Analytics Edge, the Google Analytics connectors will usually show these incompatible fields in the list in a light grey colour (you can still select them). You must remove the incompatible fields for the query to run.

Sometimes there is another way to get the information you want — try asking in the support forum.