**Service** [AdRuleService](https://developers.google.com/ad-manager/api/reference/v202605/AdRuleService.NotNullError.Reason) [AdjustmentService](https://developers.google.com/ad-manager/api/reference/v202605/AdjustmentService.NotNullError.Reason) [AdsTxtService](https://developers.google.com/ad-manager/api/reference/v202605/AdsTxtService.NotNullError.Reason) [AudienceSegmentService](https://developers.google.com/ad-manager/api/reference/v202605/AudienceSegmentService.NotNullError.Reason) [CdnConfigurationService](https://developers.google.com/ad-manager/api/reference/v202605/CdnConfigurationService.NotNullError.Reason) [CmsMetadataService](https://developers.google.com/ad-manager/api/reference/v202605/CmsMetadataService.NotNullError.Reason) [CompanyService](https://developers.google.com/ad-manager/api/reference/v202605/CompanyService.NotNullError.Reason) [ContactService](https://developers.google.com/ad-manager/api/reference/v202605/ContactService.NotNullError.Reason) [ContentBundleService](https://developers.google.com/ad-manager/api/reference/v202605/ContentBundleService.NotNullError.Reason) [ContentService](https://developers.google.com/ad-manager/api/reference/v202605/ContentService.NotNullError.Reason) [CreativeService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeService.NotNullError.Reason) [CreativeSetService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeSetService.NotNullError.Reason) [CreativeTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeTemplateService.NotNullError.Reason) [CreativeWrapperService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeWrapperService.NotNullError.Reason) [CustomFieldService](https://developers.google.com/ad-manager/api/reference/v202605/CustomFieldService.NotNullError.Reason) [CustomTargetingService](https://developers.google.com/ad-manager/api/reference/v202605/CustomTargetingService.NotNullError.Reason) [DaiAuthenticationKeyService](https://developers.google.com/ad-manager/api/reference/v202605/DaiAuthenticationKeyService.NotNullError.Reason) [DaiEncodingProfileService](https://developers.google.com/ad-manager/api/reference/v202605/DaiEncodingProfileService.NotNullError.Reason) [ForecastService](https://developers.google.com/ad-manager/api/reference/v202605/ForecastService.NotNullError.Reason) [InventoryService](https://developers.google.com/ad-manager/api/reference/v202605/InventoryService.NotNullError.Reason) [LabelService](https://developers.google.com/ad-manager/api/reference/v202605/LabelService.NotNullError.Reason) [LineItemCreativeAssociationService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemCreativeAssociationService.NotNullError.Reason) [LineItemService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemService.NotNullError.Reason) [LineItemTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemTemplateService.NotNullError.Reason) [LiveStreamEventService](https://developers.google.com/ad-manager/api/reference/v202605/LiveStreamEventService.NotNullError.Reason) **MobileApplicationService** [NativeStyleService](https://developers.google.com/ad-manager/api/reference/v202605/NativeStyleService.NotNullError.Reason) [NetworkService](https://developers.google.com/ad-manager/api/reference/v202605/NetworkService.NotNullError.Reason) [OrderService](https://developers.google.com/ad-manager/api/reference/v202605/OrderService.NotNullError.Reason) [PlacementService](https://developers.google.com/ad-manager/api/reference/v202605/PlacementService.NotNullError.Reason) [ProposalLineItemService](https://developers.google.com/ad-manager/api/reference/v202605/ProposalLineItemService.NotNullError.Reason) [ProposalService](https://developers.google.com/ad-manager/api/reference/v202605/ProposalService.NotNullError.Reason) [PublisherQueryLanguageService](https://developers.google.com/ad-manager/api/reference/v202605/PublisherQueryLanguageService.NotNullError.Reason) [ReportService](https://developers.google.com/ad-manager/api/reference/v202605/ReportService.NotNullError.Reason) [SegmentPopulationService](https://developers.google.com/ad-manager/api/reference/v202605/SegmentPopulationService.NotNullError.Reason) [SiteService](https://developers.google.com/ad-manager/api/reference/v202605/SiteService.NotNullError.Reason) [StreamActivityMonitorService](https://developers.google.com/ad-manager/api/reference/v202605/StreamActivityMonitorService.NotNullError.Reason) [SuggestedAdUnitService](https://developers.google.com/ad-manager/api/reference/v202605/SuggestedAdUnitService.NotNullError.Reason) [TargetingPresetService](https://developers.google.com/ad-manager/api/reference/v202605/TargetingPresetService.NotNullError.Reason) [TeamService](https://developers.google.com/ad-manager/api/reference/v202605/TeamService.NotNullError.Reason) [UserService](https://developers.google.com/ad-manager/api/reference/v202605/UserService.NotNullError.Reason) [UserTeamAssociationService](https://developers.google.com/ad-manager/api/reference/v202605/UserTeamAssociationService.NotNullError.Reason) [YieldGroupService](https://developers.google.com/ad-manager/api/reference/v202605/YieldGroupService.NotNullError.Reason) **Dependencies** [NotNullError](https://developers.google.com/ad-manager/api/reference/v202605/MobileApplicationService.NotNullError) ▼ **NotNullError.Reason**

The reasons for the target error.

*** ** * ** ***

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

| Enumeration | Description |
|---|---|
| `ARG1_NULL` | Assuming that a method will not have more than 3 arguments, if it does, return NULL |
| `ARG2_NULL` |   |
| `ARG3_NULL` |   |
| `NULL` |   |
| `UNKNOWN` | The value returned if the actual value is not exposed by the requested API version. |