AI-generated Key Takeaways
- 
          NotNullError is a type of ApiError that can occur in various services like AdRuleService, AdjustmentService, and SiteService. 
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          NotNullError is defined within the namespace https://www.google.com/apis/ads/publisher/v202502.
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          NotNullError includes a reasonfield which specifies the cause of the error, with possible reasons such asARG1_NULLandUNKNOWN.
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          NotNullError inherits fields from ApiError, including fieldPath,fieldPathElements,trigger, anderrorString.
- 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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