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 : zc=4&max=1600&src=https://www.morphdesigns.co.uk/wp-content/uploads/2020/06/Green-Chair-365x292-1.jpg
TimThumb version : PhotoBlocks