Update app.py

app.py

@@ -70,7 +70,7 @@ def gen_fn(model_str, prompt, negative_prompt=None, noise=None, cfg_scale=None,
             # Check if the image is completely black
             black = Image.new('RGB', image.size, (0, 0, 0))
             if ImageChops.difference(image, black).getbbox() is None:
-                return None, 'The image is completely black. There may be a parameter that cannot be specified, or an error may have occurred internally.'
+                return None, 'The image is completely black. There may be a parameter that cannot be specified, or an error may have occurred internally. Try regenerating it. If the problem still cannot be resolved, try giving up, changing the parameters, or reducing the type or number of parameters.'
 
             return image, None