diff --git a/.changeset/eleven-points-crash.md b/.changeset/eleven-points-crash.md
new file mode 100644
index 0000000..db74de5
--- /dev/null
+++ b/.changeset/eleven-points-crash.md
@@ -0,0 +1,5 @@
+---
+'@crystallize/import-utilities': patch
+---
+
+reject an Error not a string
diff --git a/src/bootstrap-tenant/bootstrapper/utils/index.ts b/src/bootstrap-tenant/bootstrapper/utils/index.ts
index 6a962e9..f3732fb 100644
--- a/src/bootstrap-tenant/bootstrapper/utils/index.ts
+++ b/src/bootstrap-tenant/bootstrapper/utils/index.ts
@@ -61,14 +61,14 @@ export interface AreaWarning {
 export interface AreaError {
   message: string
   code:
-    | 'UPLOAD_FAILED'
-    | 'SHAPE_ID_MISSING'
-    | 'CANNOT_HANDLE_SHAPE'
-    | 'CANNOT_HANDLE_ITEM'
-    | 'CANNOT_HANDLE_PRODUCT'
-    | 'CANNOT_HANDLE_ITEM_RELATION'
-    | 'PARENT_FOLDER_NOT_FOUND'
-    | 'OTHER'
+  | 'UPLOAD_FAILED'
+  | 'SHAPE_ID_MISSING'
+  | 'CANNOT_HANDLE_SHAPE'
+  | 'CANNOT_HANDLE_ITEM'
+  | 'CANNOT_HANDLE_PRODUCT'
+  | 'CANNOT_HANDLE_ITEM_RELATION'
+  | 'PARENT_FOLDER_NOT_FOUND'
+  | 'OTHER'
   item?: JSONItem
 }
 
@@ -233,10 +233,8 @@ export class FileUploadManager extends KillableWorker {
       }
 
       if (isLastAttempt) {
-        const msg = fileNotFound
-          ? `Got 404 for file "${item.url}"`
-          : e.message || JSON.stringify(e, null, 1)
-        item.reject?.(msg)
+        const msg = fileNotFound ? `Got 404 for file "${item.url}"` : e.message || JSON.stringify(e, null, 1)
+        item.reject?.(new Error(msg))
         removeWorker(item)
       } else {
         item.failCount++