Parser Error Message: Cannot use 'partitionResolver' unless the mode is 'StateServer' or 'SQLServer'.

Fix by:

In the Ban Man Pro web.config you should see this:

    <sessionState
            mode="InProc"
            cookieless="false"
            timeout="120"
    />

Change the tag so it becomes: 

    <sessionState
            mode="InProc"
            cookieless="false"
            timeout="120"
            partitionResolverType=""
    />

Next, you will likely experience this error:

Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

 Add this in the Ban Man Pro web.config after <system.web> tag:

 <trust level="Full" originUrl="" />

Finally, make sure the Pages tag has session state enabled:

 <pages enableSessionState="true" validateRequest="true" enableEventValidation="true" />