Go to Center Admin Web.config .Change the following setting it works for me.
Find membership tag
<membership defaultProvider="i">
<providers>
<add name="FBAMemberShipProvider" type="KBLMembership.OdbcMembershipProvider, KBLMembership, Version=1.0.0.0, Culture=neutral, PublicKeyToken=84ea470bcc6094aa" connectionStringName="FBAMemberShipProviderString"
enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="true" writeExceptionsToEventLog="true" passwordFormat="Clear" applicationName="FBA" />
</providers>
</membership>
Replace with
<membership defaultProvider="FBAMemberShipProvider">
<providers>
<add name="FBAMemberShipProvider" type="KBLMembership.OdbcMembershipProvider, KBLMembership, Version=1.0.0.0, Culture=neutral, PublicKeyToken=84ea470bcc6094aa" connectionStringName="FBAMemberShipProviderString"
enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="true" writeExceptionsToEventLog="true" passwordFormat="Clear" applicationName="FBA"
enableSearchMethods="true" />
</providers>
</membership>