criticalServer ErrorsAffects: All versions
How to Fix Session Lock Error
Fix Session Lock Error by stopping duplicate server instances and deleting the session.lock file.
Quick Fix
Stop all other instances using the world, then delete session.lock from the world folder.
Error Message
The save is being accessed from another locationHow to Fix
1
Stop all other Minecraft instances using this world
2
Delete session.lock from the world folder
3
Ensure only one server points to each world directory
4
Do not share world folders between servers
Common Causes
- Two server instances trying to use the same world
- Previous server did not shut down cleanly, leaving session.lock
- Singleplayer and server using the same world folder
Diagnostic Steps
- Check for other running Minecraft processes
- Stop them or verify they use different worlds
- Delete session.lock in the world folder
- Start the server
FAQ
What is session.lock?
A file Minecraft creates to indicate a world is in use. It prevents two instances from corrupting the same world.