Hi Maurice,
Apologies for the delayed response. The error you are encountering is due
to the list of selected fields being null or empty. You might want to
uncomment this line " //$selector2->fields = array('feedId', 'feedType');".
Additionally, you may refer to this link
<https://developers.google.com/adwords/api/docs/appendix/selectorfields#v201607-CampaignExtensionSettingService>
for
the fields supported by the Selector for CampaignExtensionSettingService.get
<https://developers.google.com/adwords/api/docs/reference/v201605/CampaignExtensionSettingService#get>.
Furthermore, to get the list of sitelinks only, you may use the SITELINK
value for extensionType
<https://developers.google.com/adwords/api/docs/reference/v201607/CampaignExtensionSettingService.CampaignExtensionSetting#extensionType>
as
a predicate.
Thanks and regards,
Peter
AdWords API Team
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