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hey guy i dont know what i did i haven't used a mod and i get a rendering problem right

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 12/8/12 8:24 AM
Description: Exception in server tick loop

java.lang.OutOfMemoryError: Java heap space
at java.util.HashMap.resize(HashMap.java:462)
at java.util.HashMap.addEntry(HashMap.java:755)
at java.util.HashMap.put(HashMap.java:385)
at java.util.HashSet.add(HashSet.java:200)
at in.a(SourceFile:334)
at in.a(SourceFile:307)
at akg.g(SourceFile:24)
at zs.a(SourceFile:401)
at zs.a(SourceFile:338)
at xv.b(SourceFile:315)
at abr.a(SourceFile:58)
at yv.a(SourceFile:227)
at yv.b(SourceFile:242)
at yv.a(SourceFile:68)
at yv.a(SourceFile:27)
at yr.a(SourceFile:217)
at aau.a(SourceFile:450)
at im.a(SourceFile:165)
at zs.a(SourceFile:719)
at im.c(SourceFile:104)
at net.minecraft.server.MinecraftServer.e(SourceFile:513)
at bdo.a(SourceFile:83)
at bdo.c(SourceFile:99)
at net.minecraft.server.MinecraftServer.run(SourceFile:595)
at fy.run(SourceFile:856)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_17, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 893968 bytes (0 MB) / 97976320 bytes (93 MB) up to 97976320 bytes (93 MB)
JVM Flags: 8 total; -Xverify:remote -Xbootclasspath/a:/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/deploy.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/plugin.jar -XX:-UseSharedSpaces -Xmx96m -Xverify:remote -Xbootclasspath/a:/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/deploy.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/plugin.jar -XX:-UseSharedSpaces -Xmx96m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 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.
and i dont know what i did
soooo :? please help me!!!!