Firmware Path Error when trying to --run-fvp-morello-purecap CheriBSD


I am trying to run CheriBSD on Morello FVP. I am using Ubuntu 18.04 and the latest version of cmake. When I try to run "./ run-fvp-morello-purecap" I am receiving the error "Fatal error (in target run-fvp-morello-purecap): Firmware path /home/oliver/cheri/output/morello-sdk/firmware/morello-fvp is invalid, set the --run-fvp-morello-purecap/firmware-path config option!".

I'm unsure how to solve this, could I please be advised how to set the config option if that's what I need to do?

Many thanks.