Quick fix

app.py

@@ -41,7 +41,7 @@ demo = gr.Interface(
     inputs=[
         gr.inputs.Dropdown(choices=["male","female"],type='index', default="male", label="Sex"),
         gr.inputs.Slider(minimum=1.0,maximum=100.0,default=28.0,step=1.0, label="Age"),
-        gr.inputs.Dropdown(choices=["First", "Second","Third"],type='index', default="first", label="Ticket class"),
+        gr.inputs.Dropdown(choices=["First", "Second","Third"],type='index', default="First", label="Ticket class"),
         gr.inputs.Number(default=14.4542, label="Fare ($)"),
         gr.inputs.Number(default=0.0, label="Number of parents/children aboard"),
         gr.inputs.Number(default=0.0, label="Number of siblings/spouses aboard"),