Update app.py

app.py

@@ -143,6 +143,7 @@ def image_to_3d(
     req: gr.Request,
 ) -> Tuple[dict, str]:
     user_dir = os.path.join(TMP_DIR, str(req.session_hash))
+    os.makedirs(user_dir, exist_ok=True)
     outputs = pipeline.run(
         image[1],
         seed=seed,