Update app.py

app.py

@@ -31,7 +31,7 @@ def download_dataset_file(dataset_id, local_dir):
     snapshot_path = os.path.join(base_path, "snapshots", snapshot_id)
     print(f"snapshot_path: {snapshot_path}")
 
-    contents = os.listdir(source_file)
+    contents = os.listdir(snapshot_path)
     print("Contents of snapshot path:")
     print(contents)
     print("---------------------------\n")