as said in the title.

i am only using the mods to have all the current buddy card packs

what minecraft says:

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 8/17/22, 10:14 PM
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
at net.minecraftforge.logging.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:55) ~[forge-1.18.1-39.1.0-universal.jar%2364!/:?] {re:classloading}
at net.minecraftforge.client.loading.ClientModLoader.completeModLoading(ClientModLoader.java:169) ~[forge-1.18.1-39.1.0-universal.jar%2364!/:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.lambda$new$1(Minecraft.java:554) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:PausedPartialTickAccessor,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.Util.m_137521_(Util.java:409) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:classloading}
at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:548) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:PausedPartialTickAccessor,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.gui.screens.LoadingOverlay.m_6305_(LoadingOverlay.java:135) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:875) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1041) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:PausedPartialTickAccessor,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:661) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:PausedPartialTickAccessor,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:205) ~[client-1.18.1-20211210.034407-srg.jar%2360!/:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$launchService$0(CommonClientLaunchHandler.java:45) ~[fmlloader-1.18.1-39.1.0.jar%2323!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149) [bootstraplauncher-1.0.0.jar:?] {}

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] {}
-- MOD buddycardsexp --
Details:
Caused by 0: java.lang.reflect.InvocationTargetException
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:81) ~[javafmllanguage-1.18.1-39.1.0.jar%2362!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.18.1-39.1.0.jar%2361!/:?] {}
at java.util.concurrent.CompletableFuture$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) ~[?:?] {}

Caused by 1: java.lang.NoClassDefFoundError: com/sammy/malum/core/setup/item/tabs/MalumSplinterTab
	at com.wildcard.buddycardsexp.BuddycardsExpansions.<init>(BuddycardsExpansions.java:31) ~[BuddycardsExpansions-1.18.1-1.0.4.jar%2354!/:1.18.1-1.0.4] {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:81) ~[javafmllanguage-1.18.1-39.1.0.jar%2362!/:?] {}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.18.1-39.1.0.jar%2361!/:?] {}
	at java.util.concurrent.CompletableFuture$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: BuddycardsExpansions-1.18.1-1.0.4.jar
Failure message: Buddycards Expansions (buddycardsexp) has failed to load correctly
	java.lang.reflect.InvocationTargetException: null
Mod Version: 1.18.1-1.0.4
Mod Issue URL: NOT PROVIDED
Exception message: java.lang.ClassNotFoundException: com.sammy.malum.core.setup.item.tabs.MalumSplinterTab

Stacktrace:
at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] {}
at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?] {}
at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:132) ~[securejarhandler-1.0.1.jar:?] {}
at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?] {}
at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:132) ~[securejarhandler-1.0.1.jar:?] {}
at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?] {}
at com.wildcard.buddycardsexp.BuddycardsExpansions.(BuddycardsExpansions.java:31) ~[BuddycardsExpansions-1.18.1-1.0.4.jar%2354!/:1.18.1-1.0.4] {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:81) ~[javafmllanguage-1.18.1-39.1.0.jar%2362!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.18.1-39.1.0.jar%2361!/:?] {}
at java.util.concurrent.CompletableFuture$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) ~[?:?] {}

For me, it looks like it's a issue with the expansion.

It is indeed an issue with the expansion, I believe wildcard has been going through a rewrite of their mod, hence the addon is unmaintained.