Update app.py

app.py

@@ -146,7 +146,7 @@ We currently only support one image at the start of the context! Please start a
         
         for i, chat_pair in enumerate(history[start_index:]):
             if i == 0 and start_index == 1:
-                 conv_history.append(tuple('<image>\n'+chat_pair[0],chat_pair[1]))
+                 conv_history.append(tuple(['<image>\n'+chat_pair[0],chat_pair[1]]))
             else:
                 conv_history.append(tuple(chat_pair))