Icons not working

Hello undsgn,

First i like to say that the theme really rocks! awesome design.
The only problem i have, is that i cannot select any icons.
The whole "icon box" is empty, i only see "none" .
If i use a demo page with icons and save the page, all the icons transform to a circle with half color fill.
But i see this error:
Warning: Invalid argument supplied for foreach() in E:\HostingSpaces\SpekBranding\spekbranding.nl\wwwroot\wp-content\plugins\uncode-core\vc_extend\init.php on line 893

Looking forward for a solution!

Kind regards,