Ran into the same issue, try taking the wrapper value out of your settings array.
array(
'title' => 'Head',
'block' => 'h4',
'classes' => 'headings'
),
Ran into the same issue, try taking the wrapper value out of your settings array.
array(
'title' => 'Head',
'block' => 'h4',
'classes' => 'headings'
),