Update app.py

app.py

@@ -83,7 +83,9 @@ def generate(prompt: str,
              num_inference_steps_refiner: int = 50,
              secret_token: str = '') -> PIL.Image.Image:
     if secret_token != SECRET_TOKEN:
-        raise ValueError("Invalid secret token!")
+        raise gr.Error(
+            f'Invalid secret token. Please fork the original space if you want to use it for yourself.')
+
     generator = torch.Generator().manual_seed(seed)
 
     if not use_negative_prompt: