Error starting up modded server

[Kraco]

Hi there, I've just created a modpack and started a server up for it, the server launched fine without the mods but I get the following error with the mods, any help would be appreciated: 

java.io.IOException: Base resource not found: ad$b.class
        at LAYER SERVICE/optifine/optifine.Patcher.applyPatch(Patcher.java:146)
        at LAYER SERVICE/optifine/optifine.OptiFineTransformer.getOptiFineResourcePatched(OptiFineTransformer.java:396)
        at LAYER SERVICE/optifine/optifine.OptiFineTransformer.getOptiFineResourceStreamPatched(OptiFineTransformer.java:368)
        at LAYER SERVICE/optifine/optifine.OptiFineTransformer.getOptiFineResourceStream(OptiFineTransformer.java:291)
        at LAYER SERVICE/optifine/optifine.OptiFineTransformer.getOptiFineResource(OptiFineTransformer.java:260)
        at LAYER SERVICE/optifine/optifine.OptiFineTransformer.transform(OptiFineTransformer.java:171)
        at LAYER SERVICE/optifine/optifine.OptiFineTransformer.transform(OptiFineTransformer.java:1)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.TransformerHolder.transform(TransformerHolder.java:41)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.ClassTransformer.performVote(ClassTransformer.java:179)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:98)
        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:110)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.lambda$findClass$16(ModuleClassLoader.java:213)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:223)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:213)
        at [email protected]/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:130)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
        at TRANSFORMER/[email protected]/net.minecraft.Util.m_137581_(Util.java:286)
        at TRANSFORMER/[email protected]/net.minecraft.server.packs.FolderPackResources.<clinit>(FolderPackResources.java:28)
        at TRANSFORMER/[email protected]/net.minecraft.server.packs.VanillaPackResources.m_10335_(VanillaPackResources.java:217)
        at TRANSFORMER/[email protected]/net.minecraft.server.packs.VanillaPackResources.m_7211_(VanillaPackResources.java:236)
        at TRANSFORMER/[email protected]/net.minecraft.server.packs.resources.FallbackResourceManager.m_7396_(FallbackResourceManager.java:102)
        at TRANSFORMER/[email protected]/net.minecraft.server.packs.resources.SimpleReloadableResourceManager.m_7396_(SimpleReloadableResourceManager.java:74)
        at TRANSFORMER/[email protected]/net.minecraft.tags.TagLoader.m_144495_(TagLoader.java:53)
        at TRANSFORMER/[email protected]/net.minecraft.tags.TagLoader.m_144544_(TagLoader.java:138)
        at TRANSFORMER/[email protected]/net.minecraft.tags.TagManager.m_144587_(TagManager.java:74)
        at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
        at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)
[05:40:49] [main/WARN]: Failed to load datapacks, can't proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: Could not initialize class net.minecraft.server.packs.FolderPackResources
        at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396) ~[?:?]
        at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073) ~[?:?]
        at net.minecraft.server.Main.main(Main.java:151) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        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.CommonServerLaunchHandler.lambda$launchService$0(CommonServerLaunchHandler.java:46) ~[fmlloader-1.18.1-39.0.10.jar%2323!:?]
        at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.0.7.jar%235!:?]
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.0.7.jar%235!:?]
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.0.7.jar%235!:?]
        at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.0.7.jar%235!:?]
        at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.0.7.jar%235!:?]
        at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.0.7.jar%235!:?]
        at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.0.7.jar%235!:?]
        at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:90) [bootstraplauncher-0.1.17.jar:?]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class net.minecraft.server.packs.FolderPackResources
        at net.minecraft.server.packs.VanillaPackResources.m_10335_(VanillaPackResources.java:217) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        at net.minecraft.server.packs.VanillaPackResources.m_7211_(VanillaPackResources.java:236) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        at net.minecraft.server.packs.resources.FallbackResourceManager.m_7396_(FallbackResourceManager.java:102) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        at net.minecraft.server.packs.resources.SimpleReloadableResourceManager.m_7396_(SimpleReloadableResourceManager.java:74) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        at net.minecraft.tags.TagLoader.m_144495_(TagLoader.java:53) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        at net.minecraft.tags.TagLoader.m_144544_(TagLoader.java:138) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        at net.minecraft.tags.TagManager.m_144587_(TagManager.java:74) ~[server-1.18.1-20211210.034407-srg.jar%23124!:?]
        at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
        at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?]
        at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?]
        at java.util.concurrent.ForkJoinPool$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) ~[?:?]

[Kraco]

that worked thank you! sorry if this was trivial lol