Update app.py

app.py

@@ -74,7 +74,8 @@ def generate(prompt: str,
              apply_refiner: bool = False,
              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)