#19 url and isValidURL don't works

[Anonymous]

After some tracing found eror:
Fatal error: Call to undefined function: url() in
z:\home\localhost\gourmeal\libs\FormsessValidator\url.cla
ss.php on line 42

And validation of URL don't work.
All other validations works.

[Nobody/Anonymous]

Logged In: NO

I am using Validate-0.4.1 (Alpha)