AI-generated Key Takeaways
- 
          UserDomainTargetingError is a type of error found within the YieldGroupService and several other Ad Manager services. 
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          It inherits properties from ApiError including fieldPath, fieldPathElements, trigger, and errorString. 
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          The UserDomainTargetingError specifically has a 'reason' field, which can be either 'INVALID_DOMAIN_NAMES' or 'UNKNOWN'. 
- Namespace
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               https://www.google.com/apis/ads/publisher/v202502
| Field | |
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| ApiError(inherited) | |
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| UserDomainTargetingError | |
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 Enumerations 
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