A recent update to FiveM requires all servers to have a license key attached. Here is how you can get a license key and add it to your server:

1. Sign in at the following page: https://keymaster.fivem.net/
2. Select dedicated server if you have a dedicated server with us. Otherwise follow the instructions in the control panel.
3. Copy the license key that has been created
4. Login to https://control.low.ms and select your server
5. Click "Configuration Files" and then click "Text Editor" for server.cfg.
6. Scroll to the bottom and add the following line, replacing "key" with your new key.

sv_licenseKey "key"