Crash with Optifine 1.10.2

[xRock60]

[info] Amidst v4.2-beta2
[info] Current system time: 2016-07-01 13:09:48.298
[info] System.getProperty("os.name") == 'Windows 10'
[info] System.getProperty("os.version") == '10.0'
[info] System.getProperty("os.arch") == 'amd64'
[info] System.getProperty("java.version") == '1.8.0_91'
[info] System.getProperty("java.vendor") == 'Oracle Corporation'
[info] System.getProperty("sun.arch.data.model") == '64'
[info] Not using OpenGL.
[info] Biome profile activated: default
[info] using '.minecraft' directory at: 'C:\Users\Saïd\AppData\Roaming.minecraft', libraries: 'C:\Users\Saïd\AppData\Roaming.minecraft\libraries'
[info] using biome profiles at: 'biome'
[info] Scanning for profiles.
[info] Successfully loaded profile list.
[info] Beginning latest version list load.
[info] Attempting to download remote version list...
[info] Successfully loaded version list. URL: https://launchermeta.mojang.com/mc/game/version_manifest.json
[warning] cannot find valid version directory for launcher profile 'Forge'
[warning] cannot find valid version directory for launcher profile 'forge'
[info] using minecraft launcher profile 'OptiFine' with versionId '1.10.2-OptiFine_HD_U_C1'
[info] Loading libraries.
[info] Found library: C:\Users\Saïd\AppData\Roaming.minecraft\libraries\optifine\OptiFine\1.10.2_HD_U_C1\OptiFine-1.10.2_HD_U_C1.jar
[info] Found library: C:\Users\Saïd\AppData\Roaming.minecraft\libraries\net\minecraft\launchwrapper\1.7\launchwrapper-1.7.jar
[crash] Amidst has encounted an uncaught exception on the thread Thread[Thread-4,1,main]
[crash] java.lang.NoClassDefFoundError: io/netty/buffer/ByteBufOutputStream
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at amidst.mojangapi.minecraftinterface.RecognisedVersion.getMainClassFields(RecognisedVersion.java:132)
at amidst.mojangapi.minecraftinterface.RecognisedVersion.generateMagicString(RecognisedVersion.java:124)
at amidst.mojangapi.minecraftinterface.RecognisedVersion.from(RecognisedVersion.java:119)
at amidst.mojangapi.minecraftinterface.local.LocalMinecraftInterfaceBuilder.create(LocalMinecraftInterfaceBuilder.java:32)
at amidst.mojangapi.file.directory.VersionDirectory.createLocalMinecraftInterface(VersionDirectory.java:99)
at amidst.mojangapi.MojangApi.set(MojangApi.java:71)
at amidst.gui.profileselect.LocalProfileComponent.tryLoad(LocalProfileComponent.java:84)
at amidst.threading.WorkerExecutor.lambda$run$11(WorkerExecutor.java:71)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: io.netty.buffer.ByteBufOutputStream
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 14 more

[stefandollase]

This repository is no longer maintained. You can find the new repository here.

Also, Amidst does not support modded Minecraft.

You can still use Amidst with an unmodded Minecraft profile. To do so, please create a new profile with the Minecraft launcher. Call it something like "Amidst" and use that when Amidst asks you for a profile. Make sure to select the correct Minecraft version when creating the new profile.

For more information, please read the FAQ: Can I use Amidst with a modded Minecraft version?

Optifine might be supported in a future version, see toolbox4minecraft/amidst#110