Why c::set('thumbs.driver', 'im'); not working?

Im install imagemagick on server:

set in site/config/config.php:
c::set(‘thumbs.driver’, ‘im’);

and functions crop() resize() and others not working.

Maybe you have to set the path to the convert bin, see this topic: How to switch from GD to ImageMagic as image engine?

fixed by install sudo apt-get install imagemagick
im installed sudo apt-get install php-imagick and this is not works