Minecraft Forums

Hello,

Some days ago I wanted a mod pack that a youtuber used for his YouTube channel. I downloaded the mod pack and it crashes, the crash says this:

[19:54:58] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:54:58] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:54:58] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[19:54:58] [main/INFO] [FML]: Forge Mod Loader version 7.10.25.1208 for Minecraft 1.7.10 loading
[19:54:58] [main/INFO] [FML]: Java is Java HotSpot(TM) Client VM, version 1.6.0_20, running on Windows 7:x86:6.1, installed at C:\Program Files (x86)\Java\jre6
[19:54:58] [main/WARN] [FML]: The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[19:54:58] [main/WARN] [FML]: The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[19:54:58] [main/INFO] [FML]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.7.10_HD_A4.jar
[19:54:58] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:54:58] [main/INFO] [LaunchWrapper]: Loading tweak class name optifine.OptiFineForgeTweaker
[19:54:58] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[19:54:58] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:54:58] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:54:58] [main/INFO] [LaunchWrapper]: Calling tweak class optifine.OptiFineForgeTweaker
OptiFineForgeTweaker: acceptOptions
OptiFineForgeTweaker: injectIntoClassLoader
OptiFine ClassTransformer
OptiFine URL: file:/C:/Users/Usuario/AppData/Roaming/.minecraft/mods/OptiFine_1.7.10_HD_A4.jar
OptiFine ZIP file: [email protected]
[19:54:58] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[19:54:59] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[19:54:59] [main/ERROR] [FML]: The minecraft jar file:/C:/Users/Usuario/AppData/Roaming/.minecraft/versions/1.7.10-Forge10.13.0.1208/1.7.10-Forge10.13.0.1208.jar!/net/minecraft/client/ClientBrandRetriever.class appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!
[19:54:59] [main/ERROR] [FML]: For your safety, FML will not launch minecraft. You will need to fetch a clean version of the minecraft jar file
[19:54:59] [main/ERROR] [FML]: Technical information: The class net.minecraft.client.ClientBrandRetriever should have been associated with the minecraft jar file, and should have returned us a valid, intact minecraft jar location. This did not work. Either you have modified the minecraft jar file (if so run the forge installer again), or you are using a base editing jar that is changing this class (and likely others too). If you REALLY want to run minecraft in this configuration, add the flag -Dfml.ignoreInvalidMinecraftCertificates=true to the 'JVM settings' in your launcher profile.

Please can you help me resolving this problem?

Have a nice day! (And sorry for my english)

But how i make the mods work