Fabric server outputting error after updating mods. Failing to /reload

[/u/MuffinsSenpai]

After updating a few mods, none of which effect loot tables or mob drops, the server console has started outputting this on start and /reload (which then fails).

It repeats for every mob in the game.

[20:47:11 WARN] [Worker-Main-18]: [ReloadableServerRegistries] Found loot table element validation problem in {minecraft:entities/sheep@minecraft:loot_table}.pools[1].entries[0].children[0]->{minecraft:entities/sheep/white@minecraft:loot_table}.pools[1].entries[0]: Missing element mob_heads:entities/sheep/white of type minecraft:loot_table

[20:47:11 WARN] [Worker-Main-18]: [ReloadableServerRegistries] Found loot table element validation problem in {minecraft:entities/sheep@minecraft:loot_table}.pools[1].entries[0].children[0]->{minecraft:entities/sheep/white@minecraft:loot_table}.pools[2].entries[0]: Missing element name_tag:name_tag of type minecraft:loot_table

[20:47:11 WARN] [Worker-Main-18]: [ReloadableServerRegistries] Found loot table element validation problem in {minecraft:entities/sheep@minecraft:loot_table}.pools[1].entries[0].children[1]->{minecraft:entities/sheep/orange@minecraft:loot_table}.pools[1].entries[0]: Missing element mob_heads:entities/sheep/orange of type minecraft:loot_table

[20:47:11 WARN] [Worker-Main-18]: [ReloadableServerRegistries] Found loot table element validation problem in {minecraft:entities/sheep@minecraft:loot_table}.pools[1].entries[0].children[1]->{minecraft:entities/sheep/orange@minecraft:loot_table}.pools[2].entries[0]: Missing element name_tag:name_tag of type minecraft:loot_table

[20:47:11 WARN] [Worker-Main-18]: [ReloadableServerRegistries] Found loot table element validation problem in {minecraft:entities/sheep@minecraft:loot_table}.pools[1].entries[0].children[2]->{minecraft:entities/sheep/magenta@minecraft:loot_table}.pools[1].entries[0]: Missing element mob_heads:entities/sheep/magenta of type minecraft:loot_table

[20:47:11 WARN] [Worker-Main-18]: [ReloadableServerRegistries] Found loot table element validation problem in {minecraft:entities/sheep@minecraft:loot_table}.pools[1].entries[0].children[2]->{minecraft:entities/sheep/magenta@minecraft:loot_table}.pools[2].entries[0]: Missing element name_tag:name_tag of type minecraft:loot_table

[20:47:11 WARN] [Worker-Main-18]: [ReloadableServerRegistries] Found loot table element validation problem in {minecraft:entities/sheep@minecraft:loot_table}.pools[1].entries[0].children[3]->{minecraft:entities/sheep/light_blue@minecraft:loot_table}.pools[1].entries[0]: Missing element mob_heads:entities/sheep/light_blue of type minecraft:loot_table

Here is the /reload fail message:

[20:56:22 WARN] [Server thread]: [ReloadCommand] Failed to execute reload

java.util.concurrent.CompletionException: java.util.ConcurrentModificationException

at [email protected]/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315) at [email protected]/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320) at [email protected]/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1159) at [email protected]/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) at [email protected]/java.util.concurrent.CompletableFuture.postFire(CompletableFuture.java:614) at [email protected]/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:653) at [email protected]/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483) at [email protected]/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:507) at [email protected]/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1489) at [email protected]/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:2071) at [email protected]/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2033) at [email protected]/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)

Caused by: java.util.ConcurrentModificationException

at [email protected]/java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:1023) at [email protected]/java.util.LinkedHashMap$LinkedValueIterator.next(LinkedHashMap.java:1052) at [email protected]/java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1950) at [email protected]/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:144) at [email protected]/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:574) at [email protected]/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:560) at [email protected]/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:546) at [email protected]/java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230) at [email protected]/java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196) at [email protected]/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265) at [email protected]/java.util.stream.ReferencePipeline.anyMatch(ReferencePipeline.java:647) at knot//carpet.api.settings.SettingsManager.registerCommand(SettingsManager.java:599) at knot//carpet.CarpetServer.lambda$registerCarpetCommands$6(CarpetServer.java:124) at knot//carpet.CarpetServer.forEachManager(CarpetServer.java:208) at knot//carpet.CarpetServer.registerCarpetCommands(CarpetServer.java:124) at knot//net.minecraft.commands.Commands.handler$bck000$carpet$onRegister(Commands.java:3148) at knot//net.minecraft.commands.Commands.<init>(Commands.java:338) at knot//net.minecraft.server.ReloadableServerResources.<init>(ReloadableServerResources.java:40) at knot//net.minecraft.server.ReloadableServerResources.lambda$loadResources$1(ReloadableServerResources.java:80) at [email protected]/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150) ... 9 more
submitted by /u/MuffinsSenpai
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