Update gradio_app.py

gradio_app.py

@@ -56,6 +56,9 @@ def function(model_name: str, num_molecules: int, seed_num: int) -> tuple[PIL.Im
     config = model_configs[model_name]
     config.sample_num = num_molecules
 
+    if config.sample_num > 250:
+        raise gr.Error("LIMIT ERROR!")
+
     if seed_num is None or seed_num.strip() == "":
         config.seed = random.randint(0, 10000)
     else: