It looks like the page has both an older and newer version of Server Validation on it that are causing conflicts.
On the page you are viewing itself find the line of code that refers to: "WA_ValidationToolkit/WAVT_Scripts_PHP.php" (should be line 17 according to the error)
That is the old version... delete it and maybe move up the line that refers to: "webassist/form_validations/wavt_scripts_php.php" (should be line 87)
to take its place.