Call to undefined function akismet_http_post on submit

Hello,

When i fill in the required fields and press submit then i get the following error:

Fatal error: Call to undefined function akismet_http_post() in /home/sites/site800/web/wp-content/plugins/enhanced-wordpress-contactform/wp-contactform.php on line 125

I checked the php file but i cannot find any function called akismet_http_post?

Any help is appreciated.

Thanks in advance.

Regards,
Lesane