DEPTANAUse the log to identify affected data. Replacing level.dat requires evidence that this file is affected.
The message concerns level.dat. Corruption, an unexpected format or an access problem are possible; inspect the underlying exception.
net.minecraft.nbt.ReportedNbtException: Loading NBT data
The message concerns level.dat. Corruption, an unexpected format or an access problem are possible; inspect the underlying exception. Stop the game/server and make an independent copy of the world folder. Check Caused by and file access. If corruption is confirmed, test level.dat_old on a separate world copy, retaining the original files.
Open your game profile folder. Copy a file from crash-reports or logs/latest.log. Exit Code 1 alone does not explain the crash.
Analysis runs in your browser. Your log is not uploaded to DEPTANA, stored in settings, or included in a shared URL. The text limit is two million characters.
Diagnostics checks known error signatures. A match suggests what to inspect; it does not prove the sole cause. If no rule matches, the tool says so.