diff --git a/server/vbv_lernwelt/importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx b/server/vbv_lernwelt/importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx
index 3f2cb332..6239034c 100644
Binary files a/server/vbv_lernwelt/importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx and b/server/vbv_lernwelt/importer/tests/Schulungen_Durchfuehrung_Trainer.xlsx differ
diff --git a/server/vbv_lernwelt/importer/views.py b/server/vbv_lernwelt/importer/views.py
index b8b212d6..c814fdab 100644
--- a/server/vbv_lernwelt/importer/views.py
+++ b/server/vbv_lernwelt/importer/views.py
@@ -1,3 +1,4 @@
+import traceback
 from typing import Callable
 
 from django.contrib import messages
@@ -52,7 +53,12 @@ def handle_import(request, success_msg: str, importer: Callable[[str], None]):
         try:
             importer(excel_file)
         except Exception as e:
-            return render(request, "admin/importer/error.html", {"error": str(e)})
+            return render(
+                # it is a "power" feature, so we will output the traceback on error
+                request,
+                "admin/importer/error.html",
+                {"error": traceback.format_exc()},
+            )
 
         messages.info(request, success_msg)
         return redirect("admin:index")