Memberhip.CreateUser() is given an exception !!

Hi Developers,
 
Hope everybody doing well ..
 
I'm trying to work with ASP.net membership also integrated with my APP,
first I've created a sample web app to create the new users to membership table
 
I've Added the membership tag to web.config and change the connection string to my Database connString also I set ApplicationName to "\".
 
then I added "CreateUserWizard" control with the following code:
 

Membership.CreateUser(CreateUserWizard1.UserName,CreateUserWizard1.Password,CreateUserWizard1.Email);

 
But when I run the code, I have the following exception :
 
http://www.m5zn.com/newuploads/2015/03/21/jpg//9a5f11556559e6b.jpg[^]
 
Anyone help please :(