What common errors can occur when using jpgraph for creating graphs in PHP?

One common error when using jpgraph for creating graphs in PHP is the "JpGraph Error: 25128 The function imageantialias() is not available in your PHP installation. Use GD version that supports antialiasing." This error occurs when the PHP GD library does not support antialiasing, which is required by jpgraph. To solve this issue, you can disable antialiasing in jpgraph by setting the $cfg['antialias'] configuration variable to false.

// Disable antialiasing in jpgraph
$cfg['antialias'] = false;