improved debug

app.py

@@ -178,7 +178,14 @@ def evaluate_submission(file_obj, debug=False):
         spec = importlib.util.spec_from_file_location(module_name, file_path)
         student_module = importlib.util.module_from_spec(spec)
         sys.modules[module_name] = student_module
-        spec.loader.exec_module(student_module)
+        
+        try:
+            spec.loader.exec_module(student_module)
+        except Exception as e:
+            print(f"ERROR during module exec: {type(e).__name__}: {str(e)}")
+            import traceback
+            traceback.print_exc()
+            raise
         
         report = [f"## Results:\n"]