Use of undefined constant CURLOPT_FOLLOWLOCATION - assumed 'CURLOPT_FOLLOWLOCATION'" on line 395 ..

Use of undefined constant CURLOPT_FOLLOWLOCATION - assumed 'CURLOPT_FOLLOWLOCATION'" on line 395 /var/www/.../vendor/october/rain/src/Network/Http.php. Im getting the error above after I try to install plugin/ or update on Octobercms. the website is working without any errors on WAMP server on localhost but on Ubuntu it gets stack.

I have simple LAMP stack on digital ocean with ubuntu 14.04, php 5.6, apache 2, sql . curl , mcrypt, modrewrite ..these modules are enabled.

please write if you have any suggestions.

thanks