package to import data in another machine

hi

i am making a ssis package to download data from ftp  and upload it in the database of another machine .

Now all things are working fine when i run my package . but when i run the package in a stored procedure it is giving an error   Description: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.UnauthorizedAccessException: Access to the path '\\servername\folder\file is denied.

please note i have full access and control.