Update app.py

app.py

@@ -360,7 +360,7 @@ def render_file(file):
 
 def purge_chat_and_render_first(file):
     print("purge_chat_and_render_first")
-    print("file class= "+ type(file))
+    print("file class= "+ str(type(file)))
     # Purges the previous chat session so that the bot has no concept of previous documents
     chat_history = []
     history = []