Oracle connectivity error in SQL Agent scheduler

Hi,

I have created an SSIS package , that collects the data from Oracle  and load it into SQL SERVER . The package runs fine , when I run it through Microsoft BIDS. It gets failed only when I schedule it through Jobs scheduler (SQL Agent) .  I am using attunity drivers for oracle connector.

the error is:  data flow task: oracle source failed validation and returned error code 0x80004005

please advice me

thanks

Raja