FTP is not working when SSIs package is not working

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SQL-Server

It is working giving remote varible from remote Pc.
But it is not working from server.
when scheule job from server it is not working .It showing following error.
" Failed to decrypt protected XML node "DTS:Property" with error 0x8009000B "Key not valid for use in specified state.".
You may not be authorized to access this information. This error occurs when there is a cryptographic error.
Verify that the correct key is available.
End Error Error: 2012-10-11 16:32:43.07
Code: 0xC001602A
Source: Dailyjob
Connection manager "FTP Connection Manager"
Description: An error occurred in the requested FTP operation. "

Please help me...