err tmm[11662]: 01220001:3: TCL error:

We have 2 LTM boxes in our organization, on which we have done the upgrade from 10.2.4 HF7 to 11.4.1 HF5. On the previous version we have implemented a Irule for a specific client, Which is not working in the upgraded version. We are getting below error in LTM: -

Nov 16 10:04:11 seallb02 err tmm[11662]: 01220001:3: TCL error: /Common/vodafoneit_irule - can't read "::vodafoneit_users": no such variable while executing "class lookup [HTTP::username] $::vodafoneit_users"

Please also find the Irule we have configured.

when HTTP_REQUEST { binary scan [md5 [HTTP::password]] H* password

 if { [class lookup [HTTP::username] $::vodafoneit_users] equals $password } {
     log local0. "User [HTTP::username] has been authorized to access virtual server [virtual name]"

      Insert iRule-based application code here if necessary
 } else {
     if { [string length [HTTP::password]] != 0 } {
         log local0. "User [HTTP::username] has been denied access to virtual server [virtual name]"
     }    

     HTTP::respond 401 WWW-Authenticate "Basic realm=\"Secured Area\""
}

}