- Read the last lines of the Console. The error is usually printed there.
- If the server is out of memory (the console reports it, or the RAM graph sits at your limit), remove heavy mods or plugins, or upgrade your plan.
- If you recently edited a config file, undo the change or restore a backup.
- If disk is full, delete old logs or backups in Files.
- After a game update, restart once more. Servers with auto-update enabled update on restart.
- If the server is suspended, the panel shows it, usually because of an unpaid invoice. Paying the invoice reactivates it. Then press Start.
Still stuck? Open a ticket and include your server name and the last 30 lines of the console.