AI-generated Key Takeaways
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          The Custom Targeting Error is a type of API error used in various services like AdRuleService, AdjustmentService, and ForecastService. 
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          This error inherits fields from ApiError including fieldPath, fieldPathElements, trigger, and errorString. 
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          The CustomTargetingError has a specific field called 'reason' which uses an enumeration to indicate the cause of the error. 
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          The possible reasons for a Custom Targeting Error are listed, covering issues with keys, values, targeting expressions, and audience segments. 
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          The namespace for these services and errors is https://www.google.com/apis/ads/publisher/v202508.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
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| ApiError(inherited) | |
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| CustomTargetingError | |
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 Enumerations 
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