Nothing specific. When Replaced Script task with the FTP Task

I get the following error

[FTP Task] Error: Unable to connect to FTP server using "FTP Connection Manager".

But the FTP test connection succeeded and fails when executing the package.

I use the remote path value as

"\Abc.xls"

Local path value is

"C:\FTPFiles\Abc.xls"

Should i want to change anything. Also I increased the Chunk size to 1000 KB.

Just cant recognize the root cause. Please help

Thanks in advance.

Priya