Update app.py

app.py

@@ -371,7 +371,7 @@ def new_conversation(user):
     for fpath in flist:
         if os.path.exists(fpath):
             os.remove(fpath)
-    return [None, [], gr.Markdown(value=None, label-'Dialog'), gr.Image(visible=False, value=None),  gr.Image(visible=False, value=None), '',
+    return [None, [], gr.Markdown(value='', label='Dialog'), gr.Image(visible=False, value=None),  gr.Image(visible=False, value=None), '',
             gr.LinePlot(visible=False)]
 
 def updatePassword(txt):