What this error means
The net.minecraft.nbt.ReportedException: Loading NBT data error indicates that the server has encountered corrupted data while trying to read a file in the NBT (Named Binary Tag) format. This usually occurs within player data files, level.dat, or specific chunk files, preventing the server from starting or a player from joining.
Causes
- Unexpected server crashes during a save operation.
- Disk space exhaustion on the host machine.
- Incompatible mods or plugins modifying NBT structures.
- Interrupted file transfers via SFTP.
How to fix it
On AwakeNode
- Use the File Manager: Navigate to the File Manager in your panel. Locate the folder causing the issue (usually
world/playerdataorworld/region). - Identify the file: Check the latest log file in the
logs/directory to see which specific file is throwing the error. - Rename or remove: Rename the corrupted file (e.g., append
.oldto the filename) to force the server to regenerate a clean version. If the issue persists, open a Support ticket for further investigation.
On other hosts / manually
- Check the logs: Open your
latest.logfile. Look for the file path mentioned in the stack trace immediately following theReportedExceptionerror. - Backup your data: Always create a full backup of your server directory before deleting files.
- Manual removal: Using an SFTP client (like FileZilla or WinSCP), navigate to the file path identified in the logs. Delete or rename the corrupted file.
- Restart: Restart your server. If the file was a player data file, the player will lose their inventory; if it was a chunk file, that specific area of the world will regenerate.