AI-generated Key Takeaways
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          NotNullError is a type of ApiError that occurs when a required field is null. 
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          It inherits properties like fieldPath, fieldPathElements, trigger, and errorString from ApiError. 
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          NotNullError has a specific field called 'reason' which indicates why the error occurred, such as ARG1_NULL, ARG2_NULL, ARG3_NULL, NULL, or UNKNOWN. 
- Namespace
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               https://www.google.com/apis/ads/publisher/v202505
| Field | |
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| ApiError(inherited) | |
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| NotNullError | |
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 Enumerations 
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