Random error

[20:38:07] [main/FATAL]: Error executing task on Client
java.lang.NullPointerException: null
	at net.minecraft.class_634.method_11097(class_634.java:581) ~[intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_2613.method_11235(class_2613.java:57) ~[intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_2613.method_11054(class_2613.java:11) ~[intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_2600.lambda$checkThreadAndEnqueue$0(class_2600.java:34) ~[intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_1255.method_18859(class_1255.java:172) [intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_4093.method_18859(class_4093.java:23) [intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_1255.method_16075(class_1255.java:134) [intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_1255.method_5383(class_1255.java:115) [intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_310.method_1523(class_310.java:990) [intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.class_310.method_1514(class_310.java:656) [intermediary-minecraft-1.16.3-client.jar:?]
	at net.minecraft.client.main.Main.main(Main.java:215) [intermediary-minecraft-1.16.3-client.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_265]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_265]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_265]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_265]
	at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:227) [fabric-loader-0.10.0+build.208.jar:?]
	at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140) [fabric-loader-0.10.0+build.208.jar:?]
	at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26) [fabric-loader-0.10.0+build.208.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_265]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_265]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_265]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_265]
	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:?]