The relative name contains space or empty. WinZip

Error in copy Files To – The relative name contains only space or empty.
When I am trying to create a Zip file with a Web Service by using Java.util.zip application, an exception error message comes up. The Zip file is not as complicated as it contains only text files and a folder contains some images. It can be accessed with WinZip application. The error message details as follows:
Type : System – Argument Exception
Error : The relative name contains space or empty.
Source : Exceed – File system
I am using the Windows 7 as OS.
