Fatal error: Uncaught Error: Using $this when not in object context in /volume1/web/packages/system/panels/cms/010_pages/editor/htmlmode/lightbox.tpl.php on line 12

Error: Using $this when not in object context in /volume1/web/packages/system/panels/cms/010_pages/editor/htmlmode/lightbox.tpl.php on line 12

Call Stack:
    0.0001     360032   1. {main}() /volume1/web/packages/system/panels/cms/010_pages/editor/htmlmode/lightbox.tpl.php:0