Having an issue with creating an iRule using HTTP::Path

Hello,

When I try creating an iRule I get the following error (I'm on v12.1.2):

error: [undefined procedure: HTTP::Path][HTTP::Path]

Here is the iRule (slight edit on URLs for security reasons):

when HTTP_REQUEST {
    if { [class match [IP::client_addr] equals example_dg] } {
        switch -glob [string tolower [HTTP::Path]] {
            "/test/url/*" -
            "/test/this/url/*" {
                event disable
            }
            default {
                reject
            }
        }
    }
}

I do not see anything wrong with this rule in the syntax - but I've been staring at it for awhile and might have gone blind to what may be causing it.

Is anyone able to shed some light?