Error message

• Warning: A non-numeric value encountered in Page_Frame_Decorator->check_page_break() (linea 439 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/page_frame_decorator.cls.php).
• Warning: A non-numeric value encountered in Page_Frame_Decorator->check_page_break() (linea 439 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/page_frame_decorator.cls.php).
• Warning: A non-numeric value encountered in Page_Frame_Decorator->check_page_break() (linea 439 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/page_frame_decorator.cls.php).
• Warning: A non-numeric value encountered in Inline_Renderer->render() (linea 132 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/inline_renderer.cls.php).
• Warning: A non-numeric value encountered in Inline_Renderer->render() (linea 48 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/inline_renderer.cls.php).
• Warning: A non-numeric value encountered in Inline_Renderer->render() (linea 110 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/inline_renderer.cls.php).
• Warning: A non-numeric value encountered in Inline_Renderer->render() (linea 110 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/inline_renderer.cls.php).
• Warning: A non-numeric value encountered in Page_Frame_Decorator->check_page_break() (linea 439 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/page_frame_decorator.cls.php).
• Warning: A non-numeric value encountered in Page_Frame_Decorator->check_page_break() (linea 439 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/page_frame_decorator.cls.php).
• Warning: A non-numeric value encountered in Fixed_Positioner->position() (linea 48 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/fixed_positioner.cls.php).
• Warning: A non-numeric value encountered in Fixed_Positioner->position() (linea 57 di /var/www/clients/client167/web634/web/sites/all/libraries/dompdf/include/fixed_positioner.cls.php).