JayCP has an anti-theft system that requires a serial key to be entered. The key is used to verify the legitimacy of the app.
To generate a serial key, you need to log in to Jaycp.app and navigate to the "Serial Key" page. Here you can generate a new key by clicking the "New Key" button.
Enter a name for the key and the domain where JayCP will be running. After, the key will be generated and displayed on the page. You won't be able to see this key again.
Once the key is generated, you need to add it to the .env file in the root directory of the app.