Authentication Forms: No exact match found

Hello.
 
I have the issue ?No exact match found? when using People Picker in MOSS with Forms Authentication.
I've try to add ASP.NET membership user to sharepoint in internal website as well as in SP Central Administration. But has the error ?No exact match found?.
 
There are the changes I did in internal website web.config:
 
<connectionStrings>
    <add connectionString="server=692COFTBALLWSSV\SQLEXPRESS;database=AcAspNetDB;Integrated Security=SSPI;" providerName="System.Data.SqlClient" />
  </connectionStrings>
 
<!-- membership provider -->
    <membership defaultProvider="AcAspNetSqlMembershipProvider">
      <providers>
        <add connectionStringName="AcSqlConnString" ...