AI-generated Key Takeaways
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          RequiredCollectionError is an ApiError subclass used to indicate issues with collection size in the Google Ad Manager API. 
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          It includes fields inherited from ApiError such as fieldPath, fieldPathElements, trigger, and errorString. 
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          RequiredCollectionError has a specific field called reasonwhich uses the RequiredCollectionError.Reason enumeration.
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          The possible reasons for a RequiredCollectionError are REQUIRED, TOO_LARGE, TOO_SMALL, and UNKNOWN. 
- Namespace
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               https://www.google.com/apis/ads/publisher/v202505
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| ApiError(inherited) | |
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| RequiredCollectionError | |
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 Enumerations 
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