Fatal error: Uncaught Error: Interface 'Concrete\Core\Navigation\Modifier\ModifierInterface' not found in /home/gmcguire/public_html/concrete5/concrete/src/Navigation/Modifier/AppendHTMLModifier.php:10 Stack trace: #0 {main} thrown in /home/gmcguire/public_html/concrete5/concrete/src/Navigation/Modifier/AppendHTMLModifier.php on line 10