Update app.py

app.py

@@ -259,6 +259,9 @@ def add_message(history, message):
 
 @spaces.GPU
 def bot(history, temperature, top_p, max_output_tokens):
+    if not history:
+        gr.Warning("Only one image can be uploaded in a conversation. Please reduce the number of images and start a new conversation.")
+        return history 
     print("### turn start history",history)
     print("### turn start conv",our_chatbot.conversation)
     text = history[-1][0]