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[1.12] Dangerous alternative prefix


PegBeard
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I recently switched to using the registry event, for my blocks and items. This is working fine, but I noticed that I am getting a 'Dangerous alternative prefix' warning when running my mod with virtually any other mod.
I'm no expert, but it seems like, when another mod registers items, etc, the event fires and my mod is registering content in the middle of the other mod. I say this because:

Dangerous alternative prefix `dungeontactics` for name `dungeonpedia`, expected `forestry` invalid registry invocation/invalid name?

This seems to indicate that forge is expecting, in this case, a registry from forestry, but is getting mine instead.

I have been told that this is just a warning and I don't need to worry about it, but I was wondering if there is anything I can do about it - preferably prevent what is causing the warning, not just hide it from the log.

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    • yes it does, I have tried deleting the world data several times but it keeps throwing me this error.
    • Does this happen on a fresh world?
    • [26.10 10:24:18] [Server] [main/ERROR] [minecraft/SaveFormat]: Exception reading ./world/level.dat [26.10 10:24:18] [Server] java.lang.IllegalStateExceptionNot a JSON Object: null [26.10 10:24:18] [Server]     at com.google.gson.JsonElement.getAsJsonObject(JsonElement.java:90) ~[server-1.16.5-20210115.111550-extra.jar:?] {} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport$IResourceAccess$1.func_241879_a(WorldSettingsImport.java:193) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport.func_241805_a_(WorldSettingsImport.java:131) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport.func_240885_a_(WorldSettingsImport.java:105) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$flatMap$10(DataResult.java:138) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport.func_241797_a_(WorldSettingsImport.java:104) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.SimpleRegistryCodec.func_240862_a_(SourceFile:35) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$null$13(DataResult.java:143) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$flatMap$15(DataResult.java:142) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.datafixers.util.Either$Right.map(Either.java:99) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.SimpleRegistryCodec.decode(SourceFile:35) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder$2.decode(Decoder.java:63) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Codec$2.decode(Codec.java:71) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder.parse(Decoder.java:18) ~[?:?] {re:classloading,re:mixin} [26.10 10:24:18] [Server]     at com.mojang.serialization.codecs.FieldDecoder.decode(FieldDecoder.java:29) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapCodec$1.decode(MapCodec.java:34) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.codecs.RecordCodecBuilder$Instance$5.decode(RecordCodecBuilder.java:324) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.codecs.RecordCodecBuilder$2.decode(RecordCodecBuilder.java:107) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapDecoder.lambda$compressedDecode$0(MapDecoder.java:52) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$flatMap$10(DataResult.java:138) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapDecoder.compressedDecode(MapDecoder.java:52) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapCodec$MapCodecCodec.decode(MapCodec.java:91) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder$1.decode(Decoder.java:49) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Codec$2.decode(Codec.java:71) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder.decode(Decoder.java:22) ~[?:?] {re:classloading,re:mixin} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder.parse(Decoder.java:26) ~[?:?] {re:classloading,re:mixin} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.func_237259_a_(SaveFormat.java:99) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.lambda$getReader$4(SaveFormat.java:197) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.func_237266_a_(SaveFormat.java:158) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.func_237263_a_(SaveFormat.java:63) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat$LevelSave.func_237284_a_(SaveFormat.java:324) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.server.Main.main(Main.java:139) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at net.minecraftforge.fml.loading.FMLServerLaunchProvider.lambda$launchService$0(FMLServerLaunchProvider.java:51) ~[custom.jar:36.{} [26.10 10:24:18] [Server]     at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {} [26.10 10:24:18] [Server]     at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {} [26.10 10:24:18] [Server]     at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {} [26.10 10:24:18] [Server]     at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {re:classloading} [26.10 10:24:18] [Server]     at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraftforge.server.ServerMain$Runner.runLauncher(ServerMain.java:63) [custom.jar:?] {} [26.10 10:24:18] [Server]     at net.minecraftforge.server.ServerMain$Runner.access$100(ServerMain.java:60) [custom.jar:?] {} [26.10 10:24:18] [Server]     at net.minecraftforge.server.ServerMain.main(ServerMain.java:57) [custom.jar:?] {} [26.10 10:24:18] [Server] [main/ERROR] [minecraft/SaveFormat]: Exception reading ./world/level.dat_old [26.10 10:24:18] [Server] java.lang.IllegalStateExceptionNot a JSON Object: null [26.10 10:24:18] [Server]     at com.google.gson.JsonElement.getAsJsonObject(JsonElement.java:90) ~[server-1.16.5-20210115.111550-extra.jar:?] {} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport$IResourceAccess$1.func_241879_a(WorldSettingsImport.java:193) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport.func_241805_a_(WorldSettingsImport.java:131) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport.func_240885_a_(WorldSettingsImport.java:105) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$flatMap$10(DataResult.java:138) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.WorldSettingsImport.func_241797_a_(WorldSettingsImport.java:104) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.SimpleRegistryCodec.func_240862_a_(SourceFile:35) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$null$13(DataResult.java:143) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$flatMap$15(DataResult.java:142) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.datafixers.util.Either$Right.map(Either.java:99) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at net.minecraft.util.registry.SimpleRegistryCodec.decode(SourceFile:35) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder$2.decode(Decoder.java:63) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Codec$2.decode(Codec.java:71) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder.parse(Decoder.java:18) ~[?:?] {re:classloading,re:mixin} [26.10 10:24:18] [Server]     at com.mojang.serialization.codecs.FieldDecoder.decode(FieldDecoder.java:29) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapCodec$1.decode(MapCodec.java:34) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.codecs.RecordCodecBuilder$Instance$5.decode(RecordCodecBuilder.java:324) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.codecs.RecordCodecBuilder$2.decode(RecordCodecBuilder.java:107) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapDecoder.lambda$compressedDecode$0(MapDecoder.java:52) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.lambda$flatMap$10(DataResult.java:138) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapDecoder.compressedDecode(MapDecoder.java:52) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.MapCodec$MapCodecCodec.decode(MapCodec.java:91) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder$1.decode(Decoder.java:49) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Codec$2.decode(Codec.java:71) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder.decode(Decoder.java:22) ~[?:?] {re:classloading,re:mixin} [26.10 10:24:18] [Server]     at com.mojang.serialization.Decoder.parse(Decoder.java:26) ~[?:?] {re:classloading,re:mixin} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.func_237259_a_(SaveFormat.java:99) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.lambda$getReader$4(SaveFormat.java:197) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.func_237266_a_(SaveFormat.java:165) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat.func_237263_a_(SaveFormat.java:63) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.world.storage.SaveFormat$LevelSave.func_237284_a_(SaveFormat.java:324) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A} [26.10 10:24:18] [Server]     at net.minecraft.server.Main.main(Main.java:139) ~[?:?] {re:classloading} [26.10 10:24:18] [Server]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_{} [26.10 10:24:18] [Server]     at net.minecraftforge.fml.loading.FMLServerLaunchProvider.lambda$launchService$0(FMLServerLaunchProvider.java:51) ~[custom.jar:36.{} [26.10 10:24:18] [Server]     at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {} [26.10 10:24:18] [Server]     at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
    • Yeah that's why I said "more or less." I'm unfamiliar with the official mappings.
    • 1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.
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