The For Each File enumerator is empty

Hi,

I am using Sql server 2012. In my project whenever I run the Package individually, it run successfully. But while executing the package through SSIS task, I get the following warning and not able to transfer the data from flat file to DB.

Foreach Loop Container:Warning: The For Each File enumerator is empty. The For Each File enumerator did not find any files that matched the file pattern, or the specified directory was empty.

kindly help.

.Net