[10:13:28] [main/ERROR]: Error loading companion plugin class [net.kyrptonaught.inventorysorter.compat.InventorySorterMixinPlugin] for mixin config [net.kyrptonaught.inventorysorter.json]. The plugin may be out of date: ClassNotFoundException:net.kyrptonaught.inventorysorter.compat.InventorySorterMixinPlugin
java.lang.ClassNotFoundException: net.kyrptonaught.inventorysorter.compat.InventorySorterMixinPlugin
at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_275]
at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_275]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) ~[?:1.8.0_275]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_275]
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:168) ~[fabric-loader-0.10.8.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_275]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_275]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_275]
at net.fabricmc.loader.launch.knot.MixinServiceKnot.findClass(MixinServiceKnot.java:83) ~[fabric-loader-0.10.8.jar:?]
at org.spongepowered.asm.mixin.transformer.PluginHandle.(PluginHandle.java:96) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinConfig.onSelect(MixinConfig.java:598) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.selectConfigs(MixinProcessor.java:475) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:437) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:415) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:285) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:208) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178) [sponge-mixin-0.8.2+build.24.jar:0.8.2+build.24+unknown-b24.git-unknown]
at org.spongepowered.asm.mixin.transformer.FabricMixinTransformerProxy.transformClassBytes(FabricMixinTransformerProxy.java:23) [fabric-loader-0.10.8.jar:0.8.2+build.24+unknown-b24.git-unknown]
at net.fabricmc.loader.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:157) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:150) [fabric-loader-0.10.8.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) [?:1.8.0_275]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_275]
at java.lang.Class.forName(Class.java:348) [?:1.8.0_275]
at net.fabricmc.loader.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:45) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.EntrypointStorage$NewEntry.create(EntrypointStorage.java:114) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:101) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.EntrypointStorage.getEntrypointContainers(EntrypointStorage.java:186) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.FabricLoader.getEntrypointContainers(FabricLoader.java:272) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:44) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:36) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:139) [fabric-loader-0.10.8.jar:?]
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:27) [fabric-loader-0.10.8.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_275]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_275]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_275]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_275]
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196) [NewLaunch.jar:?]
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231) [NewLaunch.jar:?]
at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]

Fixed in 1.7.6