Hi Nabeelah,
Are you using a report definition with
XML or
AWQL to run this report? When using AWQL, you cannot use the date type ALL_TIME. You can omit the DURING clause to get all time stats. You should expect to see INVALID_DURING_CLAUSE when using ALL_TIME.
Since you are getting INVALID_FIELD_NAME_FOR_REPORT, there may be another field you are using that is causing this. Please make sure that you are not using any of the fields listed under
"Not compatible with the following fields:" along with ImpressionReach.
If you are not using any incompatible fields, please send me your report definition through reply privately to author so that I can take a look.
Regards,
Anthony
AdWords API Team