Error

[dutchpatriot]

I get this error while running the generator script:
ERROR: marker not found - (} mainnet_hard_forks[] = {)[^;]+(};)

[MetrisVailore]

Maybe you have already finished with this a long time ago, but who will have an error,
check whether you have made your config file and changed it.
Remove core/monero.json from extensions in config file.
At least it worked for me.