[23:42:08] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.ClassNotFoundException: net.minecraft.client.main.Main
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_312]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_312]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_312]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_312]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [fancymenu.general.mixin.json:MixinGuiScreen from mod unknown-owner] from phase [DEFAULT] in config [fancymenu.general.mixin.json] FAILED during PREPARE
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinError(MixinProcessor.java:655) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinPrepareError(MixinProcessor.java:601) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:557) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:476) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:452) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:304) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:240) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:208) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:72) ~[!mixinbooter-8.9.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
... 6 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTargetAlreadyLoadedException: Critical problem: fancymenu.general.mixin.json:MixinGuiScreen from mod unknown-owner target net.minecraft.client.gui.GuiScreen was loaded too early.
at org.spongepowered.asm.mixin.transformer.MixinInfo.readDeclaredTargets(MixinInfo.java:949) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinInfo.(MixinInfo.java:883) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepareMixins(MixinConfig.java:853) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepare(MixinConfig.java:782) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:554) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:476) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:452) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:304) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:240) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:208) ~[!mixinbooter-8.9.jar:?]
at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:72) ~[!mixinbooter-8.9.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
... 6 more

this is on a fresh install on version 0.52

can you add the entire crash report?
its saved under \instance\crash-reports