Hi, The error "Invalid field name : "AveragePosition, Clicks, Impressions" is being thrown because these fields are metrics in the ADGROUP_PERFORMANCE_REPORT <https://developers.google.com/adwords/api/docs/appendix/reports/adgroup-performance-report>. You will be able to get fields only which are attributes of the AdGroup if you are calling the AdGroupCriterionService. Instead, if you create a reportdefinition <https://developers.google.com/adwords/api/docs/guides/reporting#create_a_report_definition>, you will be able to get these fields in your report. Please refer the guide <https://developers.google.com/adwords/api/docs/samples/php/reporting> for a sample code. If you have further questions, could you please create a new thread as this would help us to keep track of issues?
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