BlackBerry web browser unable to connect

When I start the Browser with the default BrowserSession object, an error keeps appearing:

unable to connect to the selected mobile data service, please try again later

if this problem persists please c开发者_运维知识库ontact your administrator.

so can anyone help me to solve this problem?

This is the line of code used to launch the browser:

Browser.getDefaultSession().displayPage("http://www.google.com");