Error on startup

[andreasdc]

Failed to start Minecraft:
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:228)
at net.fabricmc.loader.launch.knot.Knot.launch(Knot.java:146)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:28)
... 8 more
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:226)
... 10 more
Caused by: java.lang.LinkageError: loader constraint violation: when resolving interface method 'com.mojang.serialization.MapCodec com.mojang.serialization.Codec.fieldOf(java.lang.String)' the class loader net.fabricmc.loader.launch.knot.KnotClassLoader @3cce5371 of the current class, net/minecraft/class_2689, and the class loader 'app' for the method's defining class, com/mojang/serialization/Codec, have different Class objects for the type com/mojang/serialization/MapCodec used in the signature (net.minecraft.class_2689 is in unnamed module of loader net.fabricmc.loader.launch.knot.KnotClassLoader @3cce5371, parent loader net.fabricmc.loader.launch.knot.KnotClassLoader$DynamicURLClassLoader @3ad83a66; com.mojang.serialization.Codec is in unnamed module of loader 'app')
at net.minecraft.class_2689.method_30040(class_2689.java:75)
at net.minecraft.class_2689.(class_2689.java:41)
at net.minecraft.class_2689$class_2690.method_11668(class_2689.java:154)
at net.minecraft.class_2248.(class_2248.java:178)
at net.minecraft.class_2493.(class_2493.java:16)
at net.minecraft.class_2500.(class_2500.java:17)
at net.minecraft.class_2372.(class_2372.java:16)
at net.minecraft.class_2246.(class_2246.java:107)
at net.minecraft.class_3523.(class_3523.java:13)
at net.minecraft.class_5471.(class_5471.java:11)
at net.minecraft.class_5458.method_30573(class_5458.java:44)
at net.minecraft.class_5458.method_30566(class_5458.java:75)
at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:723)
at net.minecraft.class_5458.(class_5458.java:74)
at net.minecraft.class_2378.(class_2378.java:237)
at net.minecraft.class_2966.method_12851(class_2966.java:42)
at net.minecraft.client.main.Main.main(Main.java:137)
... 15 more