The game crashed whilst initializing game
The game crashed whilst initializing game
Error: java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors!

And a crash report of;
---- Minecraft Crash Report ----
// Ouch. That hurt :(

Time: 5/24/19 4:04 AM
Description: Initializing game

java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors!
at net.fabricmc.loader.entrypoint.hooks.EntrypointUtils.logErrors(EntrypointUtils.java:45)
at net.fabricmc.loader.entrypoint.hooks.EntrypointClient.start(EntrypointClient.java:34)
at net.minecraft.class_310.method_1503(class_310.java)
at net.minecraft.class_310.method_1514(class_310.java:395)
at net.minecraft.client.main.Main.main(Main.java:154)
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:170)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:129)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
Suppressed: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/network/ServerSidePacketRegistry
at de.siphalor.tweed.Core.onInitialize(Core.java:56)
at net.fabricmc.loader.entrypoint.hooks.EntrypointClient$$Lambda$1323/786808973.accept(Unknown Source)
at net.fabricmc.loader.entrypoint.hooks.EntrypointUtils.lambda$logErrors$0(EntrypointUtils.java:38)
at net.fabricmc.loader.entrypoint.hooks.EntrypointUtils$$Lambda$1324/1919135940.accept(Unknown Source)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at net.fabricmc.loader.entrypoint.hooks.EntrypointUtils.logErrors(EntrypointUtils.java:36)
... 11 more
Caused by: java.lang.ClassNotFoundException: net.fabricmc.fabric.api.network.ServerSidePacketRegistry
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:160)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 17 more

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

-- Head --
Thread: Client thread
Stacktrace:
at net.fabricmc.loader.entrypoint.hooks.EntrypointUtils.logErrors(EntrypointUtils.java:45)
at net.fabricmc.loader.entrypoint.hooks.EntrypointClient.start(EntrypointClient.java:34)
at net.minecraft.class_310.method_1503(class_310.java)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.class_310.method_1514(class_310.java:395)
at net.minecraft.client.main.Main.main(Main.java:154)
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:170)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:129)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)

-- System Details --
Details:
Minecraft Version: 1.14.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2208714648 bytes (2106 MB) / 2583691264 bytes (2464 MB) up to 6442450944 bytes (6144 MB)
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx6G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Launched Version: fabric-loader-0.4.7+build.153-1.14.1+build.10
LWJGL: 3.2.1 build 12
OpenGL: NO CONTEXT
GL Caps:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
Resource Packs: ERROR NullPointerException: null
Current Language: ERROR NullPointerException: null
CPU:

You don't have Fabric API installed; get it here: http://minecraft.curseforge.com/projects/fabric