Fatal error:Class 'Netzmacht\ColumnSet\Hooks' not.

There is arises a »Fatal error« because the Hooks:: isVisibleElement
method is is defined for Array
$GLOBALS['TL_HOOKS']['isVisibleElement'][] in Line:15>config.php but
nowhere make known for ClassLoader in autoload.php.
With the added line the Fatal error is past.

I hope it will help
Martin