[MC-7821] Cannot convert worlds Created: 18/Jan/13  Updated: 31/Jul/19  Resolved: 18/Jan/13

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Snapshot 13w03a
Fix Version/s: None

Type: Bug
Reporter: Ellis O'Brien Assignee: Unassigned
Resolution: Duplicate Votes: 0
Labels: None
Environment:

windows 7 64x bit java 7


Attachments: File CNBsStationinabox.rar     Text File crash-2013-01-18_21.38.51-server.txt    
Issue Links:
Duplicate
duplicates MC-5672 Crash when trying to convert an old w... Resolved
CHK:
Confirmation Status: Confirmed

 Description   

I have a world from the generator before anvil but when i try to convert it it hangs on loading world converting world then crashes with no crash report



 Comments   
Comment by Ryan Stutzman [ 31/Jul/19 ]

link - https://bugs.mojang.com/browse/MCPE-47427

Comment by Malik hankerson [ 18/Jan/18 ]

My world is 240 mb and I still cannot convert it to the new version even after all these bug fixes please tell me how to do it I wanna experience the new version it crashes at 3%

Comment by Tails [ 18/Jan/13 ]

Duplicate of MC-5672.

Comment by Kumasasa [ 18/Jan/13 ]

For convenience attached that world here.

Comment by Kumasasa [ 18/Jan/13 ]

Confirmed with this world.

Got a NPE in the console:

Jan 18, 2013 9:38:50 PM net.minecraft.server.MinecraftServer b
INFO: Converting map!
Scanning folders...
Total conversion count is 14
t: Reading NBT data
        at bq.f(SourceFile:136)
        at aaz.a(SourceFile:30)
        at ail.a(SourceFile:210)
        at ail.a(SourceFile:181)
        at ail.a(SourceFile:140)
        at net.minecraft.server.MinecraftServer.b(SourceFile:110)
        at bhc.a(SourceFile:54)
        at bhc.c(SourceFile:99)
        at net.minecraft.server.MinecraftServer.run(SourceFile:304)
        at gi.run(SourceFile:565)
Caused by: java.lang.ClassCastException: bx cannot be cast to bz
        at bq.f(SourceFile:134)
        ... 9 more
Jan 18, 2013 9:38:51 PM net.minecraft.server.MinecraftServer run
SEVERE: Encountered an unexpected exception t
t: Reading NBT data
        at bq.f(SourceFile:136)
        at aaz.a(SourceFile:30)
        at ail.a(SourceFile:210)
        at ail.a(SourceFile:181)
        at ail.a(SourceFile:140)
        at net.minecraft.server.MinecraftServer.b(SourceFile:110)
        at bhc.a(SourceFile:54)
        at bhc.c(SourceFile:99)
        at net.minecraft.server.MinecraftServer.run(SourceFile:304)
        at gi.run(SourceFile:565)
Caused by: java.lang.ClassCastException: bx cannot be cast to bz
        at bq.f(SourceFile:134)
        ... 9 more

Jan 18, 2013 9:38:51 PM net.minecraft.server.MinecraftServer run
SEVERE: This crash report has been saved to: C:\Users\user\AppData\Roaming\.minecraft\crash-reports\crash-2
Jan 18, 2013 9:38:51 PM net.minecraft.server.MinecraftServer k
INFO: Stopping server
Jan 18, 2013 9:38:51 PM net.minecraft.server.MinecraftServer k
INFO: Saving players
Jan 18, 2013 9:38:51 PM net.minecraft.server.MinecraftServer k
INFO: Saving worlds
java.lang.NullPointerException
        at net.minecraft.server.MinecraftServer.a(SourceFile:250)
        at net.minecraft.server.MinecraftServer.k(SourceFile:274)
        at bhc.k(SourceFile:219)
        at net.minecraft.server.MinecraftServer.run(SourceFile:362)
        at gi.run(SourceFile:565)

That may be an issue with only this specific world, because the report says:

-- Corrupt NBT tag --
Details:
	Tag type found: INT
	Tag type expected: LONG
	Tag name: LastUpdate
	Tag parent: Level
Comment by Ellis O'Brien [ 18/Jan/13 ]

The map was CNB Minecraft's minecart station v1.0 download here http://www.mediafire.com/?zo8gp4z58rakv2y

Comment by Tulir Asokan [ 18/Jan/13 ]

If I'm not totally wrong, I'm pretty sure that theres a crash-reports folder in .minecraft. The crash report might be there, so if you haven't already, check that.

Comment by Markku [ 18/Jan/13 ]

Might be helpful if such a world save could be downloaded from somewhere for testing (that is, if you have an account in a file sharing service which allows uploading and sharing zip files, upload the zipped world save in there). Without any means to test and not even crash report, it is near impossible to debug an issue like that.

Generated at Sun Jan 12 12:15:46 UTC 2025 using Jira 9.12.2#9120002-sha1:301bf498dd45d800842af0b84230f1bb58606c13.