Employee Portal

HI
When I am accessing Employee portal through web I got this error. Can anyone who can help me to sortedout this error.

Web Part Error: This page has encountered a critical error. Contact your system administrator if this problem persists.

[WebPartPageUserException: This page has encountered a critical error. Contact your system administrator if this problem persists.]
at Microsoft.SharePoint.ApplicationRuntime.e.b()
at Microsoft.SharePoint.ApplicationRuntime.e.a(Guid A_0)
at Microsoft.SharePoint.SPWebPartCollection.a(Boolean A_0, Boolean A_1).

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