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CreativeSetService NullError.Reason describes the reasons for validation errors specifically for null content within specified lists or containers.
The only defined reason for a NullError is NULL_CONTENT, indicating that a list or container must not contain any null elements.
The NullError.Reason enumeration is part of the CreativeSetService and is defined within the https://www.google.com/apis/ads/publisher/v202508 namespace.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-13 UTC."],[],[]]