Hopper: java.lang.StringIndexOutOfBoundsException: String index out of range: 83

java.lang.StringIndexOutOfBoundsException: String index out of range: 83
	at java.lang.String.charAt(Unknown Source)
	at java.net.URI$Parser.charAt(Unknown Source)
	at java.net.URI$Parser.scan(Unknown Source)
	at java.net.URI$Parser.checkChars(Unknown Source)
	at java.net.URI$Parser.parseHierarchical(Unknown Source)
	at java.net.URI$Parser.parse(Unknown Source)
	at java.net.URI.<init>(Unknown Source)
	at java.net.URI.<init>(Unknown Source)
	at java.io.File.toURI(Unknown Source)
	at bln.a(SourceFile:87)
	at bln.h(SourceFile:81)
	at bln.<init>(SourceFile:62)
	at atv.O(SourceFile:323)

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

Time: 9/20/13 7:12 PM
Description: Initializing game

java.lang.StringIndexOutOfBoundsException: String index out of range: 83
	at java.lang.String.charAt(Unknown Source)
	at java.net.URI$Parser.charAt(Unknown Source)
	at java.net.URI$Parser.scan(Unknown Source)
	at java.net.URI$Parser.checkChars(Unknown Source)
	at java.net.URI$Parser.parseHierarchical(Unknown Source)
	at java.net.URI$Parser.parse(Unknown Source)
	at java.net.URI.<init>(Unknown Source)
	at java.net.URI.<init>(Unknown Source)
	at java.io.File.toURI(Unknown Source)
	at bln.a(SourceFile:87)
	at bln.h(SourceFile:81)
	at bln.<init>(SourceFile:62)
	at atv.O(SourceFile:323)
	at atv.d(SourceFile:599)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at java.lang.String.charAt(Unknown Source)
	at java.net.URI$Parser.charAt(Unknown Source)
	at java.net.URI$Parser.scan(Unknown Source)
	at java.net.URI$Parser.checkChars(Unknown Source)
	at java.net.URI$Parser.parseHierarchical(Unknown Source)
	at java.net.URI$Parser.parse(Unknown Source)
	at java.net.URI.<init>(Unknown Source)
	at java.net.URI.<init>(Unknown Source)
	at java.io.File.toURI(Unknown Source)
	at bln.a(SourceFile:87)
	at bln.h(SourceFile:81)
	at bln.<init>(SourceFile:62)
	at atv.O(SourceFile:323)

-- Initialization --
Details:
Stacktrace:
	at atv.d(SourceFile:599)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 6482560 bytes (6 MB) / 26808320 bytes (25 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	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: 0, tallocated: 0
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6310 Graphics                      GL version 4.1.10834 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null