AI-generated Key Takeaways
- 
          The content lists various Ad Manager API services including AdjustmentService, CompanyService, CreativeService, and many others. 
- 
          It highlights the InventoryService and its dependency, NullError. 
- 
          NullError.Reason explains the possible reasons for validation errors, specifically NULL_CONTENT.
                  Service
               
               
                  AdjustmentService
                  CompanyService
                  CreativeService
                  CreativeSetService
                  CreativeTemplateService
                  CreativeWrapperService
                  CustomFieldService
                  CustomTargetingService
                  DaiEncodingProfileService
                  ForecastService
                  InventoryService
                  LabelService
                  LineItemCreativeAssociationService
                  LineItemService
                  LineItemTemplateService
                  LiveStreamEventService
                  MobileApplicationService
                  NativeStyleService
                  OrderService
                  PlacementService
                  ProposalService
                  PublisherQueryLanguageService
                  SiteService
                  TeamService
                  UserTeamAssociationService
               
            
                  Dependencies
               
               
                  NullError
                  
            ▼
                  NullError.Reason
               The reasons for the validation error.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| NULL_CONTENT | Specified list/container must not contain any null elements |