A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Head --
Thread: main
Suspected Mods: NONE
Stacktrace:
	at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] {}
-- MOD cataclysm --
Details:
	Caused by 0: java.lang.NoClassDefFoundError: top/theillusivec4/curios/api/type/capability/ICurioItem
		at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?] {}
		at java.lang.ClassLoader.defineClass(ClassLoader.java:1017) ~[?:?] {}
		at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:119) ~[securejarhandler-2.1.10.jar:?] {}
		at cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
		at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229) ~[securejarhandler-2.1.10.jar:?] {}
		at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
		at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135) ~[securejarhandler-2.1.10.jar:?] {}
		at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {}
		at com.github.L_Ender.cataclysm.Cataclysm.<init>(Cataclysm.java:83) ~[L_Enders_Cataclysm-1.99.6-1.20.1.jar%23146!/:1.99.6-1.20.1] {re:classloading}
		at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
		at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
		at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
		at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
		at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
		at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:70) ~[javafmllanguage-1.20.1-47.3.5.jar%23159!/:?] {}
		at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:124) ~[fmlcore-1.20.1-47.3.5.jar%23158!/:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
		at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {}
		at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}

	Mod File: /server/mods/L_Enders_Cataclysm-1.99.6-1.20.1.jar
	Failure message: Cataclysm Mod (cataclysm) has failed to load correctly
		java.lang.NoClassDefFoundError: top/theillusivec4/curios/api/type/capability/ICurioItem
	Mod Version: 1.99.5
	Mod Issue URL: NOT PROVIDED
	Exception message: java.lang.ClassNotFoundException: top.theillusivec4.curios.api.type.capability.ICurioItem
Stacktrace:
	at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] {}
	at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {}
	at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:137) ~[securejarhandler-2.1.10.jar:?] {}
	at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {}
	at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:137) ~[securejarhandler-2.1.10.jar:?] {}
	at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {}
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?] {}
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1017) ~[?:?] {}
	at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:119) ~[securejarhandler-2.1.10.jar:?] {}
	at cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
	at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229) ~[securejarhandler-2.1.10.jar:?] {}
	at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
	at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135) ~[securejarhandler-2.1.10.jar:?] {}
	at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {}
	at com.github.L_Ender.cataclysm.Cataclysm.<init>(Cataclysm.java:83) ~[L_Enders_Cataclysm-1.99.6-1.20.1.jar%23146!/:1.99.6-1.20.1] {re:classloading}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:70) ~[javafmllanguage-1.20.1-47.3.5.jar%23159!/:?] {}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:124) ~[fmlcore-1.20.1-47.3.5.jar%23158!/:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}