AI-generated Key Takeaways
- 
          NotNullError is a type of ApiError that can be inherited. 
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          NotNullError has a field called reasonwhich is of type NotNullError.Reason, an enumeration.
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          The NotNullError.Reason enumeration includes values such as ARG1_NULL, ARG2_NULL, ARG3_NULL, NULL, and UNKNOWN. 
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
| Field | |
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| ApiError(inherited) | |
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| NotNullError | |
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 Enumerations 
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