Hello, Im running a server for some people, and clients keep getting this error:

14:38:52.322 at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] {} 14:38:52.322 at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?] {} 14:38:52.322 at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {} 14:38:52.322 at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {} 14:38:52.322 at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {re:mixin,re:computing_frames} 14:38:52.322 at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {re:mixin,re:computing_frames} 14:38:52.322 at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {re:mixin} 14:38:52.363 [14:38:52] [ForkJoinPool.commonPool-worker-3/ERROR] [ne.mi.ev.EventSubclassTransformer/EVENTBUS]: Could not find parent net/minecraft/world/level/pathfinder/FlyNodeEvaluator for class com/github/alexmodguy/alexscaves/server/entity/living/CorrodentEntity$DiggingNodeEvaluator in classloader jdk.internal.loader.ClassLoaders$AppClassLoader@60f82f98 on thread Thread[ForkJoinPool.commonPool-worker-3,10,main] 14:38:52.364 [14:38:52] [ForkJoinPool.commonPool-worker-3/ERROR] [ne.mi.ev.EventSubclassTransformer/EVENTBUS]: An error occurred building event handler 14:38:52.364 java.lang.ClassNotFoundException: net.minecraft.world.level.pathfinder.FlyNodeEvaluator 14:38:52.364 at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] {} 14:38:52.364 at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188) ~[?:?] {} 14:38:52.364 at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {} 14:38:52.364 at net.minecraftforge.eventbus.EventSubclassTransformer.buildEvents(EventSubclassTransformer.java:97) ~[eventbus-6.0.5.jar:?] {} 14:38:52.364 at net.minecraftforge.eventbus.EventSubclassTransformer.transform(EventSubclassTransformer.java:48) ~[eventbus-6.0.5.jar:?] {} 14:38:52.364 at net.minecraftforge.eventbus.EventBusEngine.processClass(EventBusEngine.java:26) ~[eventbus-6.0.5.jar:?] {} 14:38:52.364 at net.minecraftforge.eventbus.service.ModLauncherService.processClassWithFlags(ModLauncherService.java:32) ~[eventbus-6.0.5.jar:6.0.5+6.0.5+master.eb8e549b] {} 14:38:52.364 at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88) ~[modlauncher-10.0.9.jar:?] {} 14:38:52.365 at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-10.0.9.jar:?] {} 14:38:52.365 at cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50) ~[modlauncher-10.0.9.jar:?] {} 14:38:52.365 at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:113) ~[securejarhandler-2.1.10.jar:?] {} 14:38:52.365 at cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {} 14:38:52.365 at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229) ~[securejarhandler-2.1.10.jar:?] {} 14:38:52.365 at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {} 14:38:52.365 at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135) ~[securejarhandler-2.1.10.jar:?] {}

I spotted some Alexs caves stuff in here so I reported. Annoylingy, Im unable to replicate this on my own device, and the modpack is quite large. If anyone has seen something like this, or knows what mod is causing this conflict, please let me know.