AI-generated Key Takeaways
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          NotNullError is a type of ApiError that can be inherited. 
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          NotNullError has a reasonfield with possible enumeration values likeARG1_NULL,ARG2_NULL,ARG3_NULL,NULL, andUNKNOWN.
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          ApiError, from which NotNullError inherits, has fields such as fieldPath,fieldPathElements,trigger, anderrorString.
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          This content primarily details the NotNullError and its inheritance from ApiError within a specific API service context. 
- Namespace
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               https://www.google.com/apis/ads/publisher/v202505
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| ApiError(inherited) | |
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| NotNullError | |
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 Enumerations 
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