Quick Books encountered a network problem

Hi,
While I was using the Quickbooks application, it stopped working and displayed the error message below. I am wondering what might be the cause of this error message. I do not remember changing any settings on my application.
Please help me fix this error. Thanks a lot.
Microsoft .NET FrameworK
An unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will be shut down immediately.
This application is not allowed to log into this QuickBooks company date file automatically. The QuickBooks administrator can grant permission for automatic login through the Integrated Application preferences.
Details Continue Quit
