AI-generated Key Takeaways
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RequiredCollectionError is a type of ApiError that can occur in various Ad Manager services.
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It includes inherited fields like fieldPath, trigger, and errorString from ApiError.
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RequiredCollectionError has a specific field called 'reason' which indicates the cause of the error.
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Possible reasons for a RequiredCollectionError include REQUIRED, TOO_LARGE, TOO_SMALL, and UNKNOWN.
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These errors can occur in services such as AdRuleService, AdsTxtService, AudienceSegmentService, and many others listed.
 
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
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                           ApiError (inherited)
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                           RequiredCollectionError
                        
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 Enumerations 
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