Fatal error: Uncaught Error: Interface "Concrete\Core\StyleCustomizer\Normalizer\VariableInterface" not found in /srv/disk3/2724534/www/redgraveresearch.com/concrete/src/StyleCustomizer/Normalizer/ColorVariable.php:7 Stack trace: #0 {main} thrown in /srv/disk3/2724534/www/redgraveresearch.com/concrete/src/StyleCustomizer/Normalizer/ColorVariable.php on line 7