**Service** [AdjustmentService](https://developers.google.com/ad-manager/api/reference/v202605/AdjustmentService.NullError.Reason) [CompanyService](https://developers.google.com/ad-manager/api/reference/v202605/CompanyService.NullError.Reason) [CreativeService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeService.NullError.Reason) [CreativeSetService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeSetService.NullError.Reason) [CreativeTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeTemplateService.NullError.Reason) [CreativeWrapperService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeWrapperService.NullError.Reason) [CustomFieldService](https://developers.google.com/ad-manager/api/reference/v202605/CustomFieldService.NullError.Reason) [CustomTargetingService](https://developers.google.com/ad-manager/api/reference/v202605/CustomTargetingService.NullError.Reason) [DaiEncodingProfileService](https://developers.google.com/ad-manager/api/reference/v202605/DaiEncodingProfileService.NullError.Reason) **ForecastService** [InventoryService](https://developers.google.com/ad-manager/api/reference/v202605/InventoryService.NullError.Reason) [LabelService](https://developers.google.com/ad-manager/api/reference/v202605/LabelService.NullError.Reason) [LineItemCreativeAssociationService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemCreativeAssociationService.NullError.Reason) [LineItemService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemService.NullError.Reason) [LineItemTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemTemplateService.NullError.Reason) [LiveStreamEventService](https://developers.google.com/ad-manager/api/reference/v202605/LiveStreamEventService.NullError.Reason) [MobileApplicationService](https://developers.google.com/ad-manager/api/reference/v202605/MobileApplicationService.NullError.Reason) [NativeStyleService](https://developers.google.com/ad-manager/api/reference/v202605/NativeStyleService.NullError.Reason) [OrderService](https://developers.google.com/ad-manager/api/reference/v202605/OrderService.NullError.Reason) [PlacementService](https://developers.google.com/ad-manager/api/reference/v202605/PlacementService.NullError.Reason) [ProposalService](https://developers.google.com/ad-manager/api/reference/v202605/ProposalService.NullError.Reason) [PublisherQueryLanguageService](https://developers.google.com/ad-manager/api/reference/v202605/PublisherQueryLanguageService.NullError.Reason) [SiteService](https://developers.google.com/ad-manager/api/reference/v202605/SiteService.NullError.Reason) [TeamService](https://developers.google.com/ad-manager/api/reference/v202605/TeamService.NullError.Reason) [UserTeamAssociationService](https://developers.google.com/ad-manager/api/reference/v202605/UserTeamAssociationService.NullError.Reason) **Dependencies** [NullError](https://developers.google.com/ad-manager/api/reference/v202605/ForecastService.NullError) ▼ **NullError.Reason**

The reasons for the validation error.

*** ** * ** ***

Namespace
:
    `https://www.google.com/apis/ads/publisher/v202605`

| Enumeration | Description |
|---|---|
| `NULL_CONTENT` | Specified list/container must not contain any null elements |