When trying to create a world, this happens:

[23:51:24] [Worker-Main-9/ERROR]: Couldn't load tag minecraft:wither_immune as it is missing following references: wpbmod:witherproofblock (from Wither Proof Block),wpbmod:witherproofglass (from Wither Proof Block)
[23:51:27] [Render thread/WARN]: Failed to load datapacks, can't proceed with server load
java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Missing required tags: ResourceKey[minecraft:root / minecraft:block]:minecraft:wither_immune
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396) ~[?:?]
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073) ~[?:?]
at net.minecraft.class_310.method_29604(class_310.java:2155) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_29610(class_310.java:2003) ~[client-intermediary.jar:?]
at net.minecraft.class_310.handler$djb000$createLevel(class_310.java:16503) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_29607(class_310.java) ~[client-intermediary.jar:?]
at net.minecraft.class_525.method_2736(class_525.java:278) ~[client-intermediary.jar:?]
at net.minecraft.class_525.method_19922(class_525.java:214) ~[client-intermediary.jar:?]
at net.minecraft.class_4185.method_25306(class_4185.java:40) ~[client-intermediary.jar:?]
at net.minecraft.class_4264.method_25348(class_4264.java:16) ~[client-intermediary.jar:?]
at net.minecraft.class_339.method_25402(class_339.java:121) ~[client-intermediary.jar:?]
at net.minecraft.class_4069.method_25402(class_4069.java:27) ~[client-intermediary.jar:?]
at net.minecraft.class_312.method_1611(class_312.java:94) ~[client-intermediary.jar:?]
at net.minecraft.class_437.method_25412(class_437.java:491) ~[client-intermediary.jar:?]
at net.minecraft.class_312.method_1601(class_312.java:94) ~[client-intermediary.jar:?]
at net.minecraft.class_312.method_22686(class_312.java:165) ~[client-intermediary.jar:?]
at net.minecraft.class_1255.execute(class_1255.java:101) ~[client-intermediary.jar:?]
at net.minecraft.class_312.method_22684(class_312.java:165) ~[client-intermediary.jar:?]
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) [lwjgl-glfw-3.2.2.jar:build 10]
at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar:build 10]
at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) [lwjgl-glfw-3.2.2.jar:build 10]
at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(RenderSystem.java:220) [client-intermediary.jar:?]
at net.minecraft.class_310.method_1523(class_310.java:1145) [client-intermediary.jar:?]
at net.minecraft.class_310.method_1514(class_310.java:733) [client-intermediary.jar:?]
at net.minecraft.client.main.Main.main(Main.java:238) [client-intermediary.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:608) [fabric-loader-0.12.12.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:77) [fabric-loader-0.12.12.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric-loader-0.12.12.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:210) [NewLaunch.jar:?]
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:245) [NewLaunch.jar:?]
at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]
Caused by: java.lang.IllegalStateException: Missing required tags: ResourceKey[minecraft:root / minecraft:block]:minecraft:wither_immune
at net.minecraft.class_3505.method_33182(class_3505.java:55) ~[client-intermediary.jar:?]
at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:718) ~[?:?]
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
at net.minecraft.class_4014.method_18365(class_4014.java:71) ~[client-intermediary.jar:?]
at net.minecraft.class_1255.method_18859(class_1255.java:151) ~[client-intermediary.jar:?]
at net.minecraft.class_4093.method_18859(class_4093.java:23) ~[client-intermediary.jar:?]
at net.minecraft.class_1255.method_16075(class_1255.java:125) ~[client-intermediary.jar:?]
at net.minecraft.class_1255.method_18857(class_1255.java:134) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_29604(class_310.java:2154) ~[client-intermediary.jar:?]
... 37 more

Full log: https://pastebin.pl/view/e7bf9260