You almost certainly need to install the "mbed serial port driver". There is a link to this driver available in the IDE's Help -> Additional Resources menu.
The requirement for this driver is described in the board's user manual (available from LPCXpresso824-MAX Board for LPC82x family MCUs|NXP ) and also mentioned in section 3.2, "LinkServer Debug Connections" of the MCUXpresso IDE v10.0.2 User Guide.
Hopefully once you have installed this, you should be up and running.
Regards,
MCUXpresso IDE Support