We usually encounter this error in the 2.0 version, which is the new version of opencart, setting.php shows the error as line 29, the process to be done is specified below.
Error: Undefined variable: text_edit in /home/..../admin/view/template/setting/setting.tpl on line 29
line with error: $data['heading_title'] = $this->language->get('heading_title');
line to change: $data['text_edit'] = $this->language->get('text_edit');
When you make the change, your problem will be fixed.
March 9, 2020, 2:43 p.m.