This issue is most likely to be caused by an internal error of the application. To overcome this, try to perform a fresh installation of the software. To do this, go to Start > Control Panel > Programs and features > select the program and hit Uninstall. After this is done, install the program again. Also, it is a good idea to update the program's version to the latest version. If the problem still persists, try to contact the developer on the following mail address for additional support : Support@sharing-file.com.