So I bought a server and I started installing the mods that I already had in my singleplayer save. The thing is, it crashed lol This is the crash report:
Description: Exception in server tick loop
java.lang.NoClassDefFoundError: net/minecraft/client/resources/I18n
at imc.common.ItemMobSpawner.getItemStackDisplayName(ItemMobSpawner.java:72)
at net.minecraft.item.ItemStack.getDisplayName(ItemStack.java:617)
at net.minecraft.item.ItemStack.getTextComponent(ItemStack.java:1048)
at net.minecraft.stats.StatList.initStats(StatList.java:201)
at net.minecraft.stats.StatList.reinit(StatList.java:346)
at net.minecraftforge.common.ForgeModContainer.mappingChanged(ForgeModContainer.java:586)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
at com.google.common.eventbus.EventBus.post(EventBus.java:217)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197)
at net.minecraftforge.fml.common.Loader.fireRemapEvent(Loader.java:916)
at net.minecraftforge.registries.GameData.freezeData(GameData.java:259)
at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:758)
at net.minecraftforge.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:108)
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:338)
at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:219)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.resources.I18n
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 27 more
