Fatal error when I login

I have completed the general settings in the correct way, but I get a fatal error when I am trying to login with my Instagram Account…

Fatal error: Call to undefined function curl_init() in /home/oleav/public_html/fll/wp-content/plugins/easy-instagram/include/Instagram-PHP-API/CurlHttpClient.php on line 35

http://wordpress.org/plugins/easy-instagram/