Fatal error: Uncaught Error: Using $this when not in object context in /volume1/web/packages/system/panels/cms/070_email/controls.tpl.php on line 2

Error: Using $this when not in object context in /volume1/web/packages/system/panels/cms/070_email/controls.tpl.php on line 2

Call Stack:
    0.0004     360672   1. {main}() /volume1/web/packages/system/panels/cms/070_email/controls.tpl.php:0