Hello, 

I am getting the following error
“Fatal error: Call to undefined function: disable_browser_cache() in /home/cas/public_html/payment.php on line 105”

While try to submit a paid links here in my directory
what should I do to resolve this error. 

thanks in advance

dotcompals answered: I tested by commenting 

disable_browser_cache() line in my payment.php file. 

Now i am getting the following error, just as I click the paypale payment button: 

Notice: SmartyValidate: [is_valid] form ‘pay_link’ is not registered. in /home/cas/public_html/libs/smarty/SmartyValidate.class.php on line 273


Notice: SmartyValidate: [validate plugin] form ‘pay_link’ is not registered. in /home/cas/public_html/libs/smarty/plugins/function.validate.php on line 46

James answered: try that payment.php from 2.1.1 zip file