User:Pmw57/Minecrafthelp/Troubleshooting/RuntimeException: Failed to check session lock

= RuntimeException: Failed to check session lock =

Problem

Trying to load a world makes the client crash, and the log states:

java.lang.RuntimeException: Failed to check session lock, aborting

Trying to create a new world and open it, however, works.

Cause

I am not aware of what might be causing this, though a solution does exist.

Solution

Open the corresponding world's save folder, and remove the 'sesion.lock' file. Then try again.

Trivia


 * Example crashlog: https://pastebin.com/56tmLSRE
 * Solution #1: https://www.beastnode.com/portal/knowledgebase/62/Failed-to-check-session-lock.html
 * Solution #2: http://www.minecraftforum.net/topic/1507302-javalangruntimeexception-failed-to-check-session-lock-aborting/