Level will not load

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 6/29/13 10:13 PM
Description: Exception in server tick loop

java.lang.OutOfMemoryError: GC overhead limit exceeded
	at java.io.FileOutputStream.writeBytes(Native Method)
	at java.io.FileOutputStream.write(Unknown Source)
	at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
	at java.io.BufferedOutputStream.flush(Unknown Source)
	at java.io.PrintStream.newLine(Unknown Source)
	at java.io.PrintStream.println(Unknown Source)
	at java.lang.Throwable.printStackTrace(Throwable.java:464)
	at java.lang.Throwable.printStackTrace(Throwable.java:451)
	at java.lang.Thread.dumpStack(Unknown Source)
	at abw.a(SourceFile:504)
	at acj.a(SourceFile:277)
	at acj.a(SourceFile:72)
	at acj.a(SourceFile:60)
	at iy.f(SourceFile:125)
	at iy.c(SourceFile:76)
	at ix.<init>(SourceFile:26)
	at iw.a(SourceFile:172)
	at iw.a(SourceFile:203)
	at gu.a(SourceFile:138)
	at gu.c(SourceFile:185)
	at gu.a(SourceFile:82)
	at bjj.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.r(SourceFile:480)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bjg.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)


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

-- System Details --
Details:
	Minecraft Version: 1.5.2
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.6.0_17, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 597438552 bytes (569 MB) / 703987712 bytes (671 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 2162 (121072 bytes; 0 MB) allocated, 2047 (114632 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: 262 (14672 bytes; 0 MB) allocated, 257 (14392 bytes; 0 MB) used
	Player Count: 1 / 8; [jc['Diabolic_Edge'/4525, l='Temple/Village', x=-206.87, y=13.53, z=574.58]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.