ERROR UPON CREATING FORM BASED AUTHENTICATION ....

Question

UPON CREATING FORM BASED AUTHENTICATION .I AM GETTING THE ERROR WHEN I CLICK ON "ASP.CONFIGURATION" FROM WEBSITE MENU, IN VISUAL STUDIO ENVIRONMENT ,AND THEN BY CLICKING ON SECURITY TAB,I AM GETTING BELOW ERROR

There is a problem with your selected data store. This can be caused by an invalid server name or credentials, or by insufficient permission. It can also be caused by the role manager feature not being enabled. Click the button below to be redirected to a page where you can choose a new data store. 

The following message may help in diagnosing the problem: Unrecognized configuration section membership. (E:\sharepointexe\formauthentication\web.config line 34)

In line 34 i have written the coding as " <membership defaultProvider="AspNetSqlMembershipProvider">"

Can anyone provide solution for this issue...