Warning: fopen(/dev/usb/lp0): Failed to open stream: Permission denied in /var/www/html/goe/vendor/mike42/escpos-php/src/Mike42/Escpos/PrintConnectors/FilePrintConnector.php on line 35

Fatal error: Uncaught Exception: Cannot initialise FilePrintConnector. in /var/www/html/goe/vendor/mike42/escpos-php/src/Mike42/Escpos/PrintConnectors/FilePrintConnector.php:37 Stack trace: #0 /var/www/html/goe/vendor/mike42/escpos-php/example/specific/97-dithering.php(10): Mike42\Escpos\PrintConnectors\FilePrintConnector->__construct() #1 {main} thrown in /var/www/html/goe/vendor/mike42/escpos-php/src/Mike42/Escpos/PrintConnectors/FilePrintConnector.php on line 37