fix: <|endoftext|> seems to be necessary

app.py

@@ -626,7 +626,7 @@ def generate(
     return output
 
 additional_inputs=[
-    gr.Textbox("", label="Optional system prompt"), #<|endoftext|>
+    gr.Textbox("<|endoftext|>", label="Optional system prompt"), #<|endoftext|>
     gr.Slider(
         label="Temperature",
         value=1.0,