The following error occurs when I plug in the USB cable to burn the firmware，This is an interesting bug: it usually fails on the first burn, but succeeds on the second or third burn
Traceback (most recent call last): File "serial/serialposix.py", line 322, in open FileNotFoundError: [Errno 2] No such file or directory: '/dev/cu.usbmodemC9B8D7EFE28C1' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "nordicsemi/dfu/dfu_transport_serial.py", line 198, in open File "serial/serialutil.py", line 244, in __init__ File "serial/serialposix.py", line 325, in open serial.serialutil.SerialException: [Errno 2] could not open port /dev/cu.usbmodemC9B8D7EFE28C1: [Errno 2] No such file or directory: '/dev/cu.usbmodemC9B8D7EFE28C1' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "nordicsemi/__main__.py", line 1545, in <module> File "click/core.py", line 1137, in __call__ File "click/core.py", line 1062, in main File "click/core.py", line 1668, in invoke File "click/core.py", line 1668, in invoke File "click/core.py", line 1404, in invoke File "click/core.py", line 763, in invoke File "nordicsemi/__main__.py", line 1022, in usb_serial File "nordicsemi/__main__.py", line 978, in do_serial File "nordicsemi/dfu/dfu.py", line 127, in dfu_send_images File "nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image File "nordicsemi/dfu/dfu_transport_serial.py", line 202, in open pc_ble_driver_py.exceptions.NordicSemiException: Serial port could not be opened on /dev/cu.usbmodemC9B8D7EFE28C1. Reason: could not open port /dev/cu.usbmodemC9B8D7EFE28C1: [Errno 2] No such file or directory: '/dev/cu.usbmodemC9B8D7EFE28C1' [9537] Failed to execute script '__main__' due to unhandled exception!
