AdwordsApi::Errors::ReportXmlError - HTTP code: 500, error type: 'ReportDownloadError.ERROR_GETTING_RESPONSE_FROM_BACKEND', trigger: 'Unable to read report data', field path: '':
The report works just fine if I remove the CampaignId field. Other fields like CampaignName, AdGroupId, and AdGroupName result in the same error.
Other attribute fields are working fine. For example, I can include AttributeValues, FeedId, or FeedItemId without any problems.
I saw another post where the issue seemed to have something to do with not including any metrics, but I am requesting metrics. There was also another post regarding an implied campaign_id, but I don't think that applies here.