This server does not have a license key specified. Please set the sv_licenseKey console variable to a key from https://keymaster.fivem.net/. (for example, `set sv_licenseKey "key"` in the config, or `+set sv_licenseKey key` on the command line)

[TheIndra]

You need to run the run.cmd using a command from your server data folder

For example create a .bat file in your cfx-server-data-master folder with

..\run.cmd +exec server.cfg

Then run that file