Dear Farshad, this is a message previously known, but still I get the message ... Is it possible not to show the user?
I take the comment that indicates the link of the forum
"In new version you can disable" Object Not Found "warnings." http://forums.unigui.com/index.php?/topic/831-object-o5cf-not-found-in-session-list-it-could-be-timed-out-refresh/?hl=object+not+found&do=findComment&comment=2215
Regards,
mmurgas