BAM Portal Web site

Hi

I am getting the following error when i try to open BAM Portal Website.

The server encountered a critical failure while trying to access the list of Views. The Business Management Web Service requires Administrator’s attention.

Use the navigation bar on the left to access Business Activity Monitoring views.
If the problem persists, contact your System Administrator

        I am beginner in BizTalk  please give me the detail steps to correct this problem.Thanking in advance