Après avoir relancer la mise à jour, la même erreur:
Successfully read file : sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream@78308db1
Successfully read file : sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream@2626b418
Loaded localization files in 22 ms!
Starting updater !
Tesseract 4
C:\Users\alexy\AppData\Roaming\.minecraft\modpacks\Tesseract 4
No update found, launching Minecraft !
Update checked in 996 ms
[17:58:46] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[17:58:46] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[17:58:46] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[17:58:46] [main/INFO] [FML]: Forge Mod Loader version 7.99.26.1481 for Minecraft 1.7.10 loading
[17:58:46] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 8.1:amd64:6.3, installed at C:\Users\alexy\Desktop\runtime\jre-x64\1.8.0_25
[17:58:46] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:58:46] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[17:58:46] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:58:46] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:58:46] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[17:58:48] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[17:58:48] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[17:58:48] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[17:58:48] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker
[17:58:49] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.TerminalTweaker
[17:58:49] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.TerminalTweaker
[17:58:49] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.ClassNotFoundException: net.minecraft.client.main.Main
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188) ~[launchwrapper-1.9.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]
at java.lang.Class.forName(Class.java:344) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:130) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
at fr.minecraftforgefrance.updater.Updater.runMinecraft(Updater.java:132) [updater-1.0.6.jar:?]
at fr.minecraftforgefrance.updater.Updater.<init>(Updater.java:95) [updater-1.0.6.jar:?]
at fr.minecraftforgefrance.updater.Updater.main(Updater.java:35) [updater-1.0.6.jar:?]
Caused by: java.lang.IllegalArgumentException
at org.objectweb.asm.ClassVisitor.<init>(Unknown Source) ~[asm-all-4.1.jar:4.1]
at cpw.mods.fml.common.asm.transformers.TerminalTransformer$ExitVisitor.<init>(TerminalTransformer.java:32) ~[forge-1.7.10-10.13.4.1481.jar:?]
at cpw.mods.fml.common.asm.transformers.TerminalTransformer$ExitVisitor.<init>(TerminalTransformer.java:25) ~[forge-1.7.10-10.13.4.1481.jar:?]
at cpw.mods.fml.common.asm.transformers.TerminalTransformer.transform(TerminalTransformer.java:19) ~[forge-1.7.10-10.13.4.1481.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:276) ~[launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:174) ~[launchwrapper-1.9.jar:?]
… 9 more