You need the GD extension in PHP to be installed.

<?php
$testGD = get_extension_funcs("gd"); // Grab function list 
if (!$testGD){ echo "GD not even installed."; exit; }
echo"<pre>".print_r($testGD,true)."</pre>";

Joe

class.graphic.inc:230: Unhandled exception [0]: Call to undefined function imagecreatetruecolor().

And the solution was to install this complement in php

sudo apt-get install php7.0-gd.

Joe

/Joe

I hope you can help me. Thanks.