$validator.methods null or not an object

$validator.methods null or not an object

Hi,

i'm trying to use jquery for the first time. i'm using the jquery validation plugin from this site: http://bassistance.de/jquery-plugins/jq ... alidation/

at first instance its working fine, ie, when i test the first textbox validation, it works perfectly throwing the required error, but when i go to the second textbox and test it, it doesn't work and throws this javascript error:

Line: 472
Char: 6
Error: '$.validator.methods[...]' is null or not an object
Code: 0

i went through the validate.js file, and it seems Line 472 is this line:

var result = $.validator.methods[method].call( this, element.value.replace(/\r/g, ""), element, rule.parameters );


what is wrong with the above line?

thanks.