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This error usually means a JSON configuration file is corrupted.
Error: java.lang.NullPointerException: Exception in server tick loop

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Fix

  1. Stop your server
  2. Go to the file manager
  3. Delete these files:
    • whitelist.json
    • banned-player.json
    • banned-ips.json
  4. Start your server
The files will regenerate automatically. Alternative: Restore a backup or fix the JSON files with a validator (ensure they start and end with []). Need help? Ask in our Discord or contact support.