diff --git a/typescript/widget/editor/editor.multifile.ts b/typescript/widget/editor/editor.multifile.ts
index ca8514328..2df620377 100644
--- a/typescript/widget/editor/editor.multifile.ts
+++ b/typescript/widget/editor/editor.multifile.ts
@@ -16,7 +16,7 @@ export declare class MultifileEditor extends Widget {
         attach_id: string;
         attach_type: string;
         filename: string;
-        errorMsg: string;
+        [key: string]: any;
     }[];
 
     upload(): void;