Hello,
The first thing to check is whether you're making your request
against the Sandbox environment. If you are, you won't get any
meaningful report results back. If you're working from the sample code
that ships with the client libraries, the comments should explain how
to switch between the Sandbox and Production environments.
Assuming you're running your reports in the Production environment,
the next two things to check is that you're requesting a meaningful
set of values for "selectedColumns" and that you're specifying a date
range for which your accounts actually have some AdWords data.
Cheers,
-Jeff Posnick, AdWords API Team
On Sep 15, 8:32 am, drakefield