Update app.py

app.py

@@ -115,8 +115,8 @@ def wait_on_run(client, thread, run):
     
     show_json("run", run)
 
-    if hasattr(run, "last_error") and run.error:
-        raise gr.Error(run.error)
+    if hasattr(run, "last_error") and run.last_error:
+        raise gr.Error(run.last_error)
 
     return run