I have tried several installation options (Magic Launcher, MCmulti, Manual Installation), but I always get a crash when I install ModLoader with Forge (in this order), without any other mods, minecraft crashes and shows this error Log:
--- BEGIN ERROR REPORT 745d8303 --------
Generated 28-04-2012 11:43
Minecraft: Minecraft 1.2.5
OS: Mac OS X (x86_64) version 10.7.3
Java: 1.6.0_31, Apple Inc.
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
LWJGL: 2.8.3
OpenGL: NVIDIA GeForce 320M OpenGL Engine version 2.1 NVIDIA-7.18.11, NVIDIA Corporation
java.lang.NoClassDefFoundError: buildcraft/silicon/TileLaser
at BuildCraftFactory.initialize(BuildCraftFactory.java:140)
at mod_BuildCraftFactory.modsLoaded(mod_BuildCraftFactory.java:36)
at ModLoader.init(ModLoader.java:899)
at ModLoader.addAllRenderers(ModLoader.java:189)
at ahu.<init>(ahu.java:77)
at ahu.<clinit>(ahu.java:
at net.minecraft.client.Minecraft.a(Minecraft.java:394)
at net.minecraft.client.Minecraft.run(Minecraft.java:732)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.ClassNotFoundException: buildcraft.silicon.TileLaser
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 9 more
--- END ERROR REPORT f5a4a760 ----------