export declare type CreativeSetErrorReason = 'VIDEO_FEATURE_REQUIRED' | 'CANNOT_CREATE_OR_UPDATE_VIDEO_CREATIVES' | 'ROADBLOCK_FEATURE_REQUIRED' | 'MASTER_CREATIVE_CANNOT_BE_COMPANION' | 'INVALID_ADVERTISER' | 'UPDATE_MASTER_CREATIVE_NOT_ALLOWED' | 'MASTER_CREATIVE_CANNOT_BELONG_TO_MULTIPLE_VIDEO_CREATIVE_SETS' | 'UNKNOWN';