I can't install cpanel & WHM : Error downloading /cpanelsync/

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http://forums.cpanel.net – Please help me, that is my install message [20130423.231316] Retrieving and staging /cpanelsync/ [20130423.232417] E Error downloading /cpanelsync/ [20130423.232417] 0 [20130423.232417] The Administrator will be notified to review this output when this script completes [20130423.232417] E Detected events which require user notification during updatenow. Will send iContact the log Cpanel::iContact: icontact /usr/sbin/sendmail is not executable by 0 [20130423.232417] Removing staged files and directories (HowTos)