Minecraft Forums

First, I am a very big novice, trying to fix the world my daughter created. From the reading that I have done I gather that I need to force an update, but i do not find the button to do that under the options menu. Also read that I should save my saves first, not exactly sure what that means. No mods are installed that we are aware of, just the basic mindcraft. Any help would be appreciated - Thanks. Here is the complete error:

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception in server tick loop

A full error report has been saved to C:\Users\Rachel\AppData\Roaming\.minecraft\crash-reports\crash-2013-03-02_12.27.14-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT a08a8b23 --------
Full report at:
C:\Users\Rachel\AppData\Roaming\.minecraft\crash-reports\crash-2013-03-02_12.27.14-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 3/2/13 12:28 PM

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_20, Sun Microsystems Inc.
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 430065944 bytes (410 MB) / 747565056 bytes (712 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 548700 (30727200 bytes; 29 MB) allocated, 548700 (30727200 bytes; 29 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 1, tcache: 0, allocated: 2, tallocated: 62
Profiler Position: N/A (disabled)
Vec3 Pool Size: 22114 (1238384 bytes; 1 MB) allocated, 22114 (1238384 bytes; 1 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

java.lang.NullPointerException
at cf.b(SourceFile:103)
at cf.a(SourceFile:35)
at iv.b(SourceFile:436)
at gm.a(SourceFile:72)
at bec.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:762)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)
--- END ERROR REPORT d61c7ed6 ----------

Quote from Reddleman

First, I am a very big novice, trying to fix the world my daughter created. From the reading that I have done I gather that I need to force an update, but i do not find the button to do that under the options menu. Also read that I should save my saves first, not exactly sure what that means. No mods are installed that we are aware of, just the basic minecraft*. Any help would be appreciated - Thanks.

Update your Java and force updating is fairly simple.

Saving your saves means that before you force update you should backup the saves folder in "C:\Users\"yournamehere"\AppData\Roaming\.minecraft" so you can restore them just in case they become corrupted in the proccess