this has happened to me many times, each time I create a world with a modpack (created myself), it says that there are errors with the datapacks and offers me to launch the world in " safe mode" or backto title screen. So I would like to know what to do to solve this problem.

 

The log :

 

[15:09:08] [main/WARN]: Failed to load datapacks, can't proceed with server load

java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Missing required tags: minecraft:block:minecraft:mineable/pickaxe

    at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357) ~[?:1.8.0_51]

    at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1887) ~[?:1.8.0_51]

    at net.minecraft.client.Minecraft.func_238189_a_(Minecraft.java:1866) ~[?:?]

    at net.minecraft.client.Minecraft.loadWorld(Minecraft.java:1714) [?:?]

    at net.minecraft.client.Minecraft.func_238192_a_(Minecraft.java:1687) [?:?]

    at net.minecraft.client.gui.screen.CreateWorldScreen.func_195352_j(CreateWorldScreen.java:260) [?:?]

    at net.minecraft.client.gui.screen.CreateWorldScreen.lambda$init$11(CreateWorldScreen.java:205) [?:?]

    at net.minecraft.client.gui.screen.CreateWorldScreen$$Lambda$29348/1180052714.onPress(Unknown Source) [?:?]

    at net.minecraft.client.gui.widget.button.Button.func_230930_b_(SourceFile:33) [?:?]

    at net.minecraft.client.gui.widget.button.AbstractButton.func_230982_a_(SourceFile:16) [?:?]

    at net.minecraft.client.gui.widget.Widget.func_231044_a_(Widget.java:136) [?:?]

    at net.minecraft.client.gui.INestedGuiEventHandler.func_231044_a_(SourceFile:27) [?:?]

    at net.minecraft.client.MouseHelper.func_198033_b(MouseHelper.java:87) [?:?]

    at net.minecraft.client.MouseHelper$$Lambda$29076/282681867.run(Unknown Source) [?:?]

    at net.minecraft.client.gui.screen.Screen.func_231153_a_(Screen.java:427) [?:?]

    at net.minecraft.client.MouseHelper.func_198023_a(MouseHelper.java:85) [?:?]

    at net.minecraft.client.MouseHelper.func_228030_c_(MouseHelper.java:181) [?:?]

    at net.minecraft.client.MouseHelper$$Lambda$29075/994091.run(Unknown Source) [?:?]

    at net.minecraft.util.concurrent.ThreadTaskExecutor.execute(SourceFile:94) [?:?]

    at net.minecraft.client.MouseHelper.func_228028_b_(MouseHelper.java:180) [?:?]

    at net.minecraft.client.MouseHelper$$Lambda$22329/279397770.invoke(Unknown Source) [?:?]

    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.glfwPollEvents(GLFW.java:3101) [lwjgl-glfw-3.2.2.jar:build 10]

    at com.mojang.blaze3d.systems.RenderSystem.flipFrame(SourceFile:109) [?:?]

    at net.minecraft.client.MainWindow.func_227802_e_(MainWindow.java:306) [?:?]

    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:997) [?:?]

    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) [?:?]

    at net.minecraft.client.main.Main.main(Main.java:184) [?:?]

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]

    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]

    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.16.5-36.2.34.jar:36.2]

    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$495/1602880207.call(Unknown Source) [forge-1.16.5-36.2.34.jar:36.2]

    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.1.3.jar:?]

    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.1.3.jar:?]

    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.1.3.jar:?]

    at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.1.3.jar:?]

    at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.1.3.jar:?]

Caused by: java.lang.IllegalStateException: Missing required tags: minecraft:block:minecraft:mineable/pickaxe

    at net.minecraft.tags.NetworkTagManager.lambda$reload$1(NetworkTagManager.java:47) ~[?:?]

    at net.minecraft.tags.NetworkTagManager$$Lambda$30766/1382585566.accept(Unknown Source) ~[?:?]

    at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:656) ~[?:1.8.0_51]

    at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:632) ~[?:1.8.0_51]

    at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442) ~[?:1.8.0_51]

    at net.minecraft.resources.AsyncReloader.func_219557_a(SourceFile:71) ~[?:?]

    at net.minecraft.resources.AsyncReloader$$Lambda$22597/554427279.run(Unknown Source) ~[?:?]

    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?]

    at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?]

    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?]

    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(SourceFile:127) ~[?:?]

    at net.minecraft.client.Minecraft.func_238189_a_(Minecraft.java:1865) ~[?:?]

    ... 37 more

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