CreateUserWizard Required email

[ChildOfLight]

'I've eliminated the required email field in the create user step by
change the required email frield to false and deleted the email text
box.
in addition I elimnitate the question text box as well by using the
following segment in the webconfig
<membership defaultProvider="SqlProvider" userIsOnlineTimeWindow="20">
<providers>
<clear/>
<add name="SqlProvider"
type="System.Web.Security.SqlMembershipProvider"
connectionStringName="LocalSqlServer" enablePasswordRetrieval="false"
enablePasswordReset="true" requiresQuestionAndAnswer="false"
passwordFormat="Hashed" applicationName="/"/>
</providers>
</membership>

When I push the create user button I still get the following message.
Please enter a valid e-mail address
from the validators.
It looks like a bug...
Does somebody know how to solve it?
10X