AI-generated Key Takeaways
- 
          The content lists various Ad Manager API services with links to their RequiredCollectionError.Reason.
- 
          The RequiredCollectionError.Reasondefines possible reasons for collection errors, including missing, too large, too small, or unknown issues.
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          The namespace for the RequiredCollectionError.Reasonis provided.
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          Specific enumeration values for RequiredCollectionError.ReasonareREQUIRED,TOO_LARGE,TOO_SMALL, andUNKNOWN.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| REQUIRED | A required collection is missing. | 
| TOO_LARGE | Collection size is too large. | 
| TOO_SMALL | Collection size is too small. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |