Update app.py

app.py

@@ -30,7 +30,7 @@ iface = gr.Interface(
     fn=generate_image,
     inputs=[
         gr.Textbox(label="Prompt", placeholder="Enter your prompt here..."),
-        gr.Textbox(label="Negative Prompt", placeholder="Enter a negative prompt here (optional)...", optional=True),
+        gr.Textbox(label="Negative Prompt", placeholder="Enter a negative prompt here (optional)..."),
         gr.Slider(label="Guidance Scale", minimum=1, maximum=20, step=0.1, default=7.5),
         gr.Slider(label="Width", minimum=768, maximum=1024, step=1, default=1024),
         gr.Slider(label="Height", minimum=768, maximum=1024, step=1, default=768),