Scheduled Tasks application installed , It stoped working after one time

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http://askubuntu.com – I installed Task Scheduler to automate the backup of the computer on Ubuntu Lucid. Scheduled task run first time. I added one task and then next time it stoped running. Everytime i run the application, the icon appears for few seconds in task bar , and application stops. I tried reinstalling and rebooting computer many times but same thins happens . Any solution to this problem. I googled this problem for a long time. I couldn't find the solution for this. (HowTos)