Fatal Error in CF7 with Dynamic Value

Hi,

I have Custom Function into CF7 Function File, as Follow

/* Generate UserInfo */
function genUsrInfo()
{
	global $current_user;
	get_currentuserinfo();
	$string = $current_user->user_login;
	return $string;
}
add_shortcode('username', 'genUsrInfo');

Now When I try to insert / use above short code “username” with Dynamic Unedited Field its shows Error

[dynamictext dynamictext-459 "'username'"]

Error Message :
Fatal error: Call to undefined method WPCF7_ContactForm::get_current() in C:\wamp\www\web\wp-content\plugins\contact-form-7-dynamic-text-extension\contact-form-7-dynamic-text-extension.php on line 59

https://wordpress.org/plugins/contact-form-7-dynamic-text-extension/