Hi

I'm using custom membership provider for backend users. The problem is: I can't log in. I'm getting error:

 No User exists with ID -1         
             Description: An unhandled exception occurred during 
the execution of the current web request. Please review the stack trace 
for more information about the error and where it originated in the 
code.

             Exception Details: System.ArgumentException: No User exists with ID -1

Here is my code:

web.config:

   <membership defaultProvider="Umb" userIsOnlineTimeWindow="15">
       <providers>
        <clear />    
        <add name="UsersMembershipProvider"  type="umbraco.providers.UsersMembershipProvider" enablePasswordRetrieval="false" enablePasswordReset="false" requiresQuestionAndAnswer="false" passwordFormat="Hashed" />    
        <add name="Umb" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="Umbraco" passwordFormat="Hashed" requiresQuestionAndAnswer="false" requiresUniqueEmail="true" applicationName="umbraco" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" />
      </providers>

    </membership>

umbracoSettings.config:

<providers>
    <users>
      <!-- if you wish to use your own membershipprovider for authenticating to the umbraco back office -->
      <!-- specify it here (remember to add it to the web.config as well) -->
      <DefaultBackofficeProvider>Umb</DefaultBackofficeProvider>
    </users>
  </providers>

What's wrong with my Custom provide? Thanks for Any help.

MR