LCD program (lpc4088 displaymodule hello world)

Hello,

Every time I tried to run a program to test my LCD module for LPC4088 I go the following message

symbol mbed_mac_address multiply defined!

what can I do?

You can give us more information, need to know a bit more than that,

Example code?
Platform board or customer build?
Mbed online, cli, studio?
Mbed lib version 2 to 5.15?

AND NO acronyms, real words!