iRule: log local0 error showing up in ltm logs

Here's the error in my logs:

tmm2 err tmm2[7592]: 01220001:3: TCL error: /Common/signal-redirect-irule - can't read "url": no such variable while executing "log local0. "$url""

when HTTP_REQUEST {

set hostname variable in lower case

set hostname [string tolower [HTTP::host]]

check if the hostname variable is in the first Data Group

if { [class match $hostname equals signal-fqdn-class] } {

set the HTTP::uri to the value found in the data group

HTTP::uri [class lookup $hostname signal-fqdn-class]

HTTP::redirect ]

check if the hostname variable is in the second Data Group

} elseif { [class match $hostname equals signal4test-fqdn-class] } {

set the HTTP::uri to the value found in the data group

HTTP::uri [class lookup $hostname signal4test-fqdn-class]

HTTP::redirect ]

}

log local0. "$hostname"

log local0. "$url"