ModLoader Error

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 03-08-2013 22:10
Description: ModLoader has failed to initialize.

java.lang.IllegalArgumentException: URI is not hierarchical
	at java.io.File.<init>(Unknown Source)
	at ModLoader.init(ModLoader.java:732)
	at ModLoader.addAllRenderers(ModLoader.java:205)
	at bgy.<init>(RenderManager.java:97)
	at bgy.<clinit>(RenderManager.java:14)
	at net.minecraft.client.Minecraft.a(SourceFile:261)
	at avv.a(SourceFile:56)
	at net.minecraft.client.Minecraft.run(SourceFile:507)
	at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 1.5.2
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 81246520 bytes (77 MB) / 128647168 bytes (122 MB) up to 2863333376 bytes (2730 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: ModLoader, EntityRendererProxy]
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	ModLoader: Mods loaded: 1
ModLoader 1.5.2