A TimThumb error has occured

The following error(s) occured:

GD Library Error: imagecreatetruecolor does not exist - please contact your webhost and ask them to install the GD library

Query String : src=http://www.constructionipaquet.ca/wp-content/uploads/2014/04/Ch%c3%a2teau-noir-3-700x700.jpg&w=455&h=185&a=t&q=100&s=1
TimThumb version : 2.8.11