Warning: fopen(/dev/ttyACM0): Failed to open stream: Permission denied in /home/www/elite.ug/ppos2/src/Mike42/Escpos/PrintConnectors/FilePrintConnector.php on line 38

Fatal error: Uncaught Exception: Cannot initialise FilePrintConnector. in /home/www/elite.ug/ppos2/src/Mike42/Escpos/PrintConnectors/FilePrintConnector.php:40 Stack trace: #0 /home/www/elite.ug/ppos2/example/customer-display.php(20): Mike42\Escpos\PrintConnectors\FilePrintConnector->__construct('/dev/ttyACM0') #1 {main} thrown in /home/www/elite.ug/ppos2/src/Mike42/Escpos/PrintConnectors/FilePrintConnector.php on line 40