fix error

app.py

@@ -281,9 +281,9 @@ with gr.Blocks() as demo:
     with gr.Row():
         with gr.Column(scale=1):
             input_image = gr.Image(type="pil", label="Upload Image")
-            system_prompt_input = gr.Textbox(label="System Prompt", value=SYSTEM_PROMPT, lines=5, interactive=True, value=None) # New system prompt input
+            system_prompt_input = gr.Textbox(label="System Prompt", value=SYSTEM_PROMPT, lines=5, interactive=True) # New system prompt input
             prompt_textbox = gr.Textbox(
-                label="Analysis Prompt", value=DEFAULT_PROMPT, lines=4, value=None
+                label="Analysis Prompt", value=DEFAULT_PROMPT, lines=4,
             )
             analyze_button = gr.Button("Analyze Image")
         with gr.Column(scale=2):