AI-generated Key Takeaways
- 
          The NullError is part of the SiteService within the Google Ad Manager API, specifically version v202505. 
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          NullError inherits from ApiError and includes fields such as fieldPath, fieldPathElements, trigger, and errorString. 
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          The NullError has a specific field called "reason" which is an enumeration with possible values like NOT_NULL and UNKNOWN. 
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202505
| Field | |
|---|---|
| ApiError(inherited) | |
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| NullError | |
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 Enumerations 
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