Update app.py

app.py

@@ -323,8 +323,8 @@ with gr.Blocks() as demo:
     soil_data_input = gr.Textbox(label="Enter your soil data", placeholder="Description, Structure, Biology", visible=False)
     yield_data_input = gr.Textbox(label="Enter your yield data", placeholder="Quantity, Quality", visible=False)
 
-    original_outputs = None
-    xml_outputs = None
+    original_outputs = []
+    xml_outputs = []
     
     with gr.Row():
         farm_output_box = gr.Textbox(label="Fields and Activities Output Data")