TCL error - no such pool

Ops!! I hope now irule will be more readable

when HTTP_REQUEST {
     If the cookie exists, connect to the IP spACCMfied in the cookie
    if { [HTTP::cookie exists "ACCM"] } {
         set need_cookie 0
         set decrypted [HTTP::cookie decrypt "ACCM" "skyisblue"]
         if { ($decrypted ne "") } {
               log local0. "REQUEST - El host [HTTP::host] se dirige al pool member $decrypted"
              set persist_node [HTTP::cookie "ACCM"]
              log local0. "El pool del miembro es: [LB::server pool]"
                foreach member [active_members -list [LB::server pool]] {
                   set node [lindex $member 0]
                        if { $node eq $persist_node } {
                             node $persist_node [lindex $member 1]
                        }
               }
        }
    } else {
         set need_cookie 1
         }
}
when LB_FAILED {
    set need_cookie 1
    LB::reselect
}
when HTTP_RESPONSE {
   if { $need_cookie } {
       HTTP::cookie insert name "ACCM" value [IP::remote_addr] path /
       HTTP::cookie encrypt "ACCM" "skyisblue"
       HTTP::cookie expires "ACCM" 86400
   }
}