AI-generated Key Takeaways
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          NotNullError is a type of ApiError that can be inherited by various services like AdRuleService, AdjustmentService, and AdsTxtService, among many others. 
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          It is part of the https://www.google.com/apis/ads/publisher/v202502namespace.
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          NotNullError has a reasonfield which is an enumeration with values such asARG1_NULL,ARG2_NULL,ARG3_NULL,NULL, andUNKNOWN.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202502
| Field | |
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| ApiError(inherited) | |
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| NotNullError | |
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 Enumerations 
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