Disabled by Upload Manager - emctl status agent

oracle@si01:/apps/product/MW/agent11g/sysman/emd> emctl status agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation.  All rights reserved.
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Agent Version     : 11.1.0.1.0
OMS Version       : 11.1.0.1.0
Protocol Version  : 11.1.0.0.0
Agent Home        : /apps/oracle/product/MW/agent11g
Agent binaries    : /apps/oracle/product/MW/agent11g
Agent Process ID  : 15478
Parent Process ID : 15458
Agent URL         : https://si01.an.com:3872/emd/main/
Repository URL    : https://si01.an.com:4900/em/upload
Started at        : 2010-06-14 12:39:18
Started by user   : oracle
Last Reload       : 2010-07-15 18:01:54
Last successful upload                       : 2010-07-29 16:08:52
Total Megabytes of XML files uploaded so far :  4571.19
Number of XML files pending upload           :        0
Size of XML files pending upload(MB)         :     0.00
Available disk space on upload filesystem    :     0.04%
Collection Status                            : Disabled by Upload Manager
Last successful heartbeat to OMS             : 2010-07-29 16:55:09

Solution:

oracle@si01:/apps/product/MW/agent11g/sysman/emd> rm lastupld.xml agntstmp.txt

oracle@si01:/apps/product/MW/agent11g/sysman/emd/upload> rm -f *
oracle@si01:/apps/product/MW/agent11g/sysman/emd/state> rm -f *.*
emctl secure agent

Securing agent...   Started.
Enter Agent Registration Password :

emctl stop agent
emctl start agent