export declare type CustomCreativeErrorReason = 'DUPLICATE_MACRO_NAME_FOR_CREATIVE' | 'SNIPPET_REFERENCES_MISSING_MACRO' | 'UNRECOGNIZED_MACRO' | 'CUSTOM_CREATIVE_NOT_ALLOWED' | 'MISSING_INTERSTITIAL_MACRO' | 'DUPLICATE_ASSET_IN_MACROS' | 'UNKNOWN';