---- Minecraft Crash Report ----
// Shall we play a game?

Time: 9/20/20 6:23 PM
Description: Initializing game

net.fabricmc.loader.api.EntrypointException: Exception while loading entries for entrypoint 'main' provided by 'modid'
at net.fabricmc.loader.EntrypointStorage.getEntrypointContainers(EntrypointStorage.java:193)
at net.fabricmc.loader.FabricLoader.getEntrypointContainers(FabricLoader.java:251)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:44)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:36)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointClient.start(EntrypointClient.java:32)
at net.minecraft.class_310.(class_310.java:423)
at net.minecraft.client.main.Main.main(Main.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:192)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at link.infra.jumploader.Jumploader.onLoad(Jumploader.java:171)
at cpw.mods.modlauncher.TransformationServiceDecorator.onLoad(TransformationServiceDecorator.java:53)
at cpw.mods.modlauncher.TransformationServicesHandler.lambda$loadTransformationServices$11(TransformationServicesHandler.java:131)
at cpw.mods.modlauncher.TransformationServicesHandler$$Lambda$54/78204644.accept(Unknown Source)
at java.util.HashMap$Values.forEach(HashMap.java:972)
at cpw.mods.modlauncher.TransformationServicesHandler.loadTransformationServices(TransformationServicesHandler.java:131)
at cpw.mods.modlauncher.TransformationServicesHandler.initializeTransformationServices(TransformationServicesHandler.java:56)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:75)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)
Caused by: java.lang.NoClassDefFoundError: fi/dy/masa/litematica/config/Configs$Generic
at io.github.eatmyvenom.litematicin.LitematicaMixinMod.(LitematicaMixinMod.java:18)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at net.fabricmc.loader.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:45)
at net.fabricmc.loader.EntrypointStorage$NewEntry.create(EntrypointStorage.java:114)
at net.fabricmc.loader.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:101)
at net.fabricmc.loader.EntrypointStorage.getEntrypointContainers(EntrypointStorage.java:186)
... 26 more
Caused by: java.lang.ClassNotFoundException: fi.dy.masa.litematica.config.Configs$Generic
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:166)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 33 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at net.fabricmc.loader.EntrypointStorage.getEntrypointContainers(EntrypointStorage.java:193)
at net.fabricmc.loader.FabricLoader.getEntrypointContainers(FabricLoader.java:251)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:44)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:36)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointClient.start(EntrypointClient.java:32)
at net.minecraft.class_310.(class_310.java:423)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.main.Main.main(Main.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:192)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at link.infra.jumploader.Jumploader.onLoad(Jumploader.java:171)
at cpw.mods.modlauncher.TransformationServiceDecorator.onLoad(TransformationServiceDecorator.java:53)
at cpw.mods.modlauncher.TransformationServicesHandler.lambda$loadTransformationServices$11(TransformationServicesHandler.java:131)
at cpw.mods.modlauncher.TransformationServicesHandler$$Lambda$54/78204644.accept(Unknown Source)
at java.util.HashMap$Values.forEach(HashMap.java:972)
at cpw.mods.modlauncher.TransformationServicesHandler.loadTransformationServices(TransformationServicesHandler.java:131)
at cpw.mods.modlauncher.TransformationServicesHandler.initializeTransformationServices(TransformationServicesHandler.java:56)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:75)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

-- System Details --
Details:
Minecraft Version: 1.16.2
Minecraft Version ID: 1.16.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 315048536 bytes (300 MB) / 664797184 bytes (634 MB) up to 3008888832 bytes (2869 MB)
CPUs: 2
JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx3228m -Xms256m -XX:PermSize=256m
Fabric Mods:
autoconfig1u: Auto Config v1 Updated 3.2.0-unstable
cloth-basic-math: Cloth Basic Math 0.5.1
cloth-client-events-v0: Cloth Client Events v0 1.4.5
cloth-config2: Cloth Config v4 4.8.1
fabric: Fabric API 0.20.0+build.399-1.16
fabric-api-base: Fabric API Base 0.1.3+12a8474cfa
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.4+c6a8ea894e
fabric-command-api-v1: Fabric Command API (v1) 1.0.8+5ce533984e
fabric-commands-v0: Fabric Commands (v0) 0.2.0+52d308364e
fabric-containers-v0: Fabric Containers (v0) 0.1.8+045df74f4e
fabric-content-registries-v0: Fabric Content Registries (v0) 0.1.9+059ea8664e
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.2+b7f9825d4e
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.0+e2e6cdad4e
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.0+16acbe5b4e
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.1+91555cd14e
fabric-item-api-v1: Fabric Item API (v1) 1.1.0+29679fd64e
fabric-item-groups-v0: Fabric Item Groups (v0) 0.2.0+438f96364e
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.0.1+730711c64e
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.2.0+3fa9f7c54e
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 1.2.0+74cc3b204e
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.0.1+432ea1884e
fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.2+b764ce994e
fabric-models-v0: Fabric Models (v0) 0.1.0+dfdb52d64e
fabric-networking-blockentity-v0: Fabric Networking Block Entity (v0) 0.2.5+b50ffc7b4e
fabric-networking-v0: Fabric Networking (v0) 0.1.10+e00ecb5f4e
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 1.7.0+432ea1884e
fabric-object-builders-v0: Fabric Object Builders (v0) 0.7.0+432ea1884e
fabric-particles-v1: fabric-particles-v1 0.2.1+0a6f2a704e
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.4.3+e5d3217f4e
fabric-renderer-api-v1: Fabric Renderer API (v1) 0.3.0+8bcfced84e
fabric-renderer-indigo: Fabric Renderer - Indigo 0.4.0+8bcfced84e
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 2.1.0+e2862de64e
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.3+b7f9825d4e
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.10+e5d3217f4e
fabric-rendering-v0: Fabric Rendering (v0) 1.1.0+534104904e
fabric-rendering-v1: Fabric Rendering (v1) 1.3.0+432ea1884e
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.3.0+432ea1884e
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.1.0+872498414e
fabric-structure-api-v1: Fabric Structure API (v1) 1.0.0+516ece7c4e
fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 1.0.3+ac8e8c594e
fabric-textures-v0: Fabric Textures (v0) 1.0.4+eae12eb84e
fabric-tool-attribute-api-v1: Fabric Tool Attribute API (v1) 1.2.2+ccce563e4e
fabricloader: Fabric Loader 0.9.3+build.207
itemscroller: Item Scroller 0.15.0-dev.20200824.205318
jumploader: Jumploader 2.0.1
malilib: MaLiLib 0.10.0-dev.21+arne.1
minecraft: Minecraft 1.16.2
mm: Manningham Mills 2.1
modid: Litematica BRRRRRRRifier 1.0.0
modmenu: Mod Menu 1.14.6+build.31
optifabric: OptiFabric 1.6.2
roughlyenoughitems: Roughly Enough Items 5.4.2
roughlyenoughitems-api: REI (API) 5.4.2
roughlyenoughitems-default-plugin: REI (Default Plugin) 5.4.2
roughlyenoughitems-runtime: REI (Runtime) 5.4.2
tellme: TellMe 0.8.1-beta.1
wurst: Wurst Client v7.5-MC1.16.2
Launched Version: Jumploader
Backend library: LWJGL version 3.2.2 build 10
Backend API: NO CONTEXT
GL Caps:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
CPU:
OptiFine Version: OptiFine_1.16.2_HD_U_G3
OptiFine Build: 20200829-104659
Shaders: null
OpenGlVersion: null
OpenGlRenderer: null
OpenGlVendor: null
CpuCount: 0

modid: Litematica BRRRRRRRifier 1.0.0 This is your problem. To start off with the mod doesn't have a proper manifest because the namespace it's using is "modid" (that's why this crashlog is so frustrating to diagnose), secondarily to that the mod was clearly made using a different version of Litematica, because the version of Litematica you are using does not contain the file fi.dy.masa.litematica.config.Configs. Get rid of whatever the hell Litematica BRRRRRRRifier is and you should be good.

Closing since this is not an issue with Fabric API and lack of feedback. Possible solution is in above message. If you need further assistance, please join the Fabric discord https://discord.gg/v6v4pMv