Role Manager feature has not been enabled (Identity)

Question

Hello,

 

I'm using webforms and I'm trying to add users to roles using the following code:

Roles.AddUserToRole(userTxt.Text, roleTxt.Text);

At first, I was getting the message "The Role Manager feature has not been enabled."

 

So, I added these lines to web.config of the Admin role

<?xml version="1.0"?>

<configuration>
  <system.web>
    <roleManager
        enabled="true"
        cacheRolesInCookie="true" >
    </roleManager>
    <authorization>
      <allow roles="Administrator"/>
      <deny users="*"/>
    </authorization>
  </system.web>
</configuration>

 Now, I get this parser error message "Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS."

 

I would appreciate any kind of help, thank you in advance.