[MC-19432] Whenever I open my worlds, it crashes. I really like these worlds, I have worked very hard on 1 of them and do not want to lose it.

Put the summary of the bug you're having here

What I expected to happen was when I opened the world, it would load in.
Describe what you thought should happen here

What actually happened was, the game crashed.
Describe what happened here

Steps to Reproduce:
1. Open Minecraft
2. Select "Single Player"
3. Select world, and hit "Play Selected World"

Environment

OS: Windows 7 (ver 6.1, arch amd64)
Java: 1.6.0_31 (by Sun Microsystems Inc.)
Launcher: 1.0.2 (bootstrap 4)
Minecraft: 1.6 (updated Tue Jun 25 09:08:56 EDT 2013)

Linked issues

duplicates 1

MC-10167 Failed to check session lock, aborting Resolved

Attachments

crash-2013-06-27_11.48.20-client.txt

Comments 4

migrated 2013-06-27T15:56:30Z

Please do not mark issues as private, unless your bug report is a security issue containing information that may compromise your server/client.

migrated 2013-06-27T15:58:30Z

I am sorry, this is the first time I have done this.

migrated 2013-06-27T15:58:32Z

Duplicate of MC-10167, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.

migrated 2013-06-27T16:01:20Z

I am sorry, this will not happen again I just clicked the report to Mojang button and it came to this...