Blackberry Mobile application getting error when attempting to access a secure API?

I developed a Blackberry application using Eclipse. The application is worki开发者_运维百科ng fine in the simulator. By using Blackberry desktop software, I tested the application in Blackberry mobile and it's working fine; but when I am using Progressbar screen, I am getting an error like this "Error starting Applicationname : Module 'ApplicationName' attempts to access a secure API."

How do I avoid this error?

you need to sign your application. read this article.

Blackberry application signing