*Every time I run Minecraft I get a crash while loading. Here's the log.
* Refers only to this version of Minecraft with ML, not all versions.
---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!
Time: 11/17/15 10:57 AM
Description: ModLoader has failed to initialize.
java.lang.IllegalArgumentException: URI is not hierarchical
at java.io.File.<init>(File.java:418)
at ModLoader.init(ModLoader.java:896)
at ModLoader.addAllRenderers(ModLoader.java:215)
at azw.<init>(RenderManager.java:92)
at azw.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Thread.java:745)
Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.8.0_25, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 47049368 bytes (44 MB) / 127139840 bytes (121 MB) up to 1060372480 bytes (1011 MB)
- JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- ModLoader: Mods loaded: 1
ModLoader 1.4.2
I deleted META-INF, relocated various classes, tried different ML versions, but I couldn't pinpoint the issue, the log seemed very vague.
I used the latest launcher, as well. Not the old one.
Please keep in mind this is a fresh install of ML, no mods.
*Every time I run Minecraft I get a crash while loading. Here's the log.
* Refers only to this version of Minecraft with ML, not all versions.---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!
Time: 11/17/15 10:57 AM
Description: ModLoader has failed to initialize.
java.lang.IllegalArgumentException: URI is not hierarchical
at java.io.File.<init>(File.java:418)
at ModLoader.init(ModLoader.java:896)
at ModLoader.addAllRenderers(ModLoader.java:215)
at azw.<init>(RenderManager.java:92)
at azw.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Thread.java:745)
Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.8.0_25, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 47049368 bytes (44 MB) / 127139840 bytes (121 MB) up to 1060372480 bytes (1011 MB)
- JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- ModLoader: Mods loaded: 1
ModLoader 1.4.2
I deleted META-INF, relocated various classes, tried different ML versions, but I couldn't pinpoint the issue, the log seemed very vague.
I used the latest launcher, as well. Not the old one.
Please keep in mind this is a fresh install of ML, no mods.
Solved. Thanks to UncleMion.

http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1291855-a-custom-tweaker-for-using-older-modloaders-in-the
Thanks for all the help!