Hello Amit

Thank you for your purchase.

Can you please tell me which version of libxml do you use.

You should find the libxml version in your php.info file.

If the version is less than 2.7.8, please go to ..wp-content/plugins/wpdatatables/source/class.wdttools.php and find this code: 

if (self::isHtml($string)) {
$string = self::stripJsAttributes($string);
}

Just comment it, so the code looks like this:

//if (self::isHtml($string)) {
//$string = self::stripJsAttributes($string);
//}

After that it should work with your version of 2.7.8.