Default Role Provider could not be found.

HI,
I got this error when I am try to create a account in my VS2010 using WSAT.
I am using the default provider but when I included in my project my db ASPNETDB I got this issue and now I cannot create a user using WSAT or loging in my web application.
I would like to have some help my dab is on App_Data.
error:
An error was encountered. Please return to the previous page and try again. 

The following message may help in diagnosing the problem: Default Role Provider could not be found. (C:\Users\touchrate\Documents\Visual Studio 2010\Projects\AFFPSellsReports\AFFPSellsReports\web.config line 46) at System.Web.Administration.WebAdminPage.CallWebAdminHelperMethod(Boolean isMembership, String methodName, Object[] par ...