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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
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<item>
            <title>[MC-11940] The game crashes immediately when trying to convert a world.</title>
                <link>https://bugs.mojang.com/browse/MC-11940</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;Whenever I try to convert an old world, the game crashes upon trying to do it. Even on a clean version it happens. It fails because of a &quot;Corrupt NBT Tag.&quot; The file goes as such:&lt;br/&gt;
---- Minecraft Crash Report ----&lt;br/&gt;
// You&apos;re mean.&lt;/p&gt;

&lt;p&gt;Time: 15/03/13 11:39 AM&lt;br/&gt;
Description: Reading NBT data&lt;/p&gt;

&lt;p&gt;java.lang.ClassCastException: bz cannot be cast to cb&lt;br/&gt;
	at bs.f(SourceFile:134)&lt;br/&gt;
	at aby.a(SourceFile:30)&lt;br/&gt;
	at ajk.a(SourceFile:215)&lt;br/&gt;
	at ajk.a(SourceFile:186)&lt;br/&gt;
	at ajk.a(SourceFile:145)&lt;br/&gt;
	at net.minecraft.server.MinecraftServer.b(SourceFile:112)&lt;br/&gt;
	at bja.a(SourceFile:59)&lt;br/&gt;
	at bja.c(SourceFile:104)&lt;br/&gt;
	at net.minecraft.server.MinecraftServer.run(SourceFile:306)&lt;br/&gt;
	at gp.run(SourceFile:573)&lt;/p&gt;


&lt;p&gt;A detailed walkthrough of the error, its code path and all known details is as follows:&lt;br/&gt;
---------------------------------------------------------------------------------------&lt;/p&gt;

&lt;p&gt;&amp;#8211; Corrupt NBT tag &amp;#8211;&lt;br/&gt;
Details:&lt;br/&gt;
	Tag type found: INT&lt;br/&gt;
	Tag type expected: LONG&lt;br/&gt;
	Tag name: LastUpdate&lt;br/&gt;
	Tag parent: Level&lt;br/&gt;
Stacktrace:&lt;br/&gt;
	at bs.f(SourceFile:134)&lt;br/&gt;
	at aby.a(SourceFile:30)&lt;br/&gt;
	at ajk.a(SourceFile:215)&lt;br/&gt;
	at ajk.a(SourceFile:186)&lt;br/&gt;
	at ajk.a(SourceFile:145)&lt;br/&gt;
	at net.minecraft.server.MinecraftServer.b(SourceFile:112)&lt;br/&gt;
	at bja.a(SourceFile:59)&lt;br/&gt;
	at bja.c(SourceFile:104)&lt;br/&gt;
	at net.minecraft.server.MinecraftServer.run(SourceFile:306)&lt;br/&gt;
	at gp.run(SourceFile:573)&lt;/p&gt;

&lt;p&gt;&amp;#8211; System Details &amp;#8211;&lt;br/&gt;
Details:&lt;br/&gt;
	Minecraft Version: 1.5&lt;br/&gt;
	Operating System: Windows 7 (amd64) version 6.1&lt;br/&gt;
	Java Version: 1.7.0_17, Oracle Corporation&lt;br/&gt;
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation&lt;br/&gt;
	Memory: 461071952 bytes (439 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)&lt;br/&gt;
	JVM Flags: 2 total; -Xms512m -Xmx1024m&lt;br/&gt;
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used&lt;br/&gt;
	Suspicious classes: No suspicious classes found.&lt;br/&gt;
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0&lt;br/&gt;
	Profiler Position: N/A (disabled)&lt;br/&gt;
	Player Count: 0 / 8; []&lt;br/&gt;
	Type: Integrated Server (map_client.txt)&lt;br/&gt;
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.&lt;/p&gt;</description>
                <environment></environment>
        <key id="26659">MC-11940</key>
            <summary>The game crashes immediately when trying to convert a world.</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="chainmanner">Gabe V</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Mar 2013 17:10:46 +0100</created>
                <updated>Sat, 23 Mar 2013 11:04:10 +0100</updated>
                            <resolved>Fri, 15 Mar 2013 17:12:44 +0100</resolved>
                                    <version>Minecraft 1.4.7</version>
                    <version>Minecraft 1.5</version>
                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                            <comments>
                            <comment id="53567" author="bljat" created="Fri, 15 Mar 2013 17:12:44 +0100"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-5672&quot; title=&quot;Crash when trying to convert an old world&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-5672&quot;&gt;&lt;del&gt;MC-5672&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10102">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="18315">MC-5672</issuekey>
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