The problem is most likely caused by a faulty or non-existent communications port:
- 1.Reconnect to the MPLAB ICE 4 In-Circuit
Emulator.
- 2.Make sure the debugger is physically connected to the computer on the appropriate
USB port.
- 3.Make sure the appropriate USB port has been selected in the debugger options (see
section Debugger Options Selection).
- 4.Make sure the USB port is not in use by another device.
- 5.If using a USB hub, make sure it is powered.
- 6.Make sure the USB drivers are loaded.