When loading a server (using aternos) I always get this error:

[09:43:49] [Server thread/ERROR] [net.minecraft.server.MinecraftServer]: Encountered an unexpected exception
1038 | net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from LLibrary (llibrary)
1039 |  
1040 | Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
1041 | at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_222]
1042 | at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[?:1.8.0_222]
1043 | at java.lang.Class.getConstructor0(Class.java:3075) ~[?:1.8.0_222]
1044 | at java.lang.Class.getDeclaredConstructor(Class.java:2178) ~[?:1.8.0_222]
1045 | at net.ilexiconn.llibrary.server.network.NetworkHandler.registerMessage(NetworkHandler.java:39) ~[NetworkHandler.class:?]
1046 | at net.ilexiconn.llibrary.server.network.NetworkHandler.injectNetworkWrapper(NetworkHandler.java:84) ~[NetworkHandler.class:?]
1047 | at net.ilexiconn.llibrary.LLibrary.onPreInit(LLibrary.java:85) ~[LLibrary.class:?]
1048 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1049 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1050 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1051 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1052 | at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:637) ~[forge.jar:?]
1053 | at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source) ~[?:?]
1054 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1055 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1056 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1057 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1058 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1059 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1060 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1061 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1062 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1063 | at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) ~[forge.jar:?]
1064 | at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[forge.jar:?]
1065 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1066 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1067 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1068 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1069 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1070 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1071 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1072 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1073 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1074 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1075 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1076 | at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136) ~[LoadController.class:?]
1077 | at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:629) ~[Loader.class:?]
1078 | at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99) ~[FMLServerHandler.class:?]
1079 | at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333) ~[FMLCommonHandler.class:?]
1080 | at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125) ~[nz.class:?]
1081 | at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) [MinecraftServer.class:?]
1082 | at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
1083 | Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP
1084 | at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
1085 | at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_222]
1086 | at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_222]
1087 | at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_222]
1088 | at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[?:1.8.0_222]
1089 | at java.lang.Class.getConstructor0(Class.java:3075) ~[?:1.8.0_222]
1090 | at java.lang.Class.getDeclaredConstructor(Class.java:2178) ~[?:1.8.0_222]
1091 | at net.ilexiconn.llibrary.server.network.NetworkHandler.registerMessage(NetworkHandler.java:39) ~[NetworkHandler.class:?]
1092 | at net.ilexiconn.llibrary.server.network.NetworkHandler.injectNetworkWrapper(NetworkHandler.java:84) ~[NetworkHandler.class:?]
1093 | at net.ilexiconn.llibrary.LLibrary.onPreInit(LLibrary.java:85) ~[LLibrary.class:?]
1094 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1095 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1096 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1097 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1098 | at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:637) ~[forge.jar:?]
1099 | at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source) ~[?:?]
1100 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1101 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1102 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1103 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1104 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1105 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1106 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1107 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1108 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1109 | at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) ~[forge.jar:?]
1110 | at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[forge.jar:?]
1111 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1112 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1113 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1114 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1115 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1116 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1117 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1118 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1119 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1120 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1121 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1122 | at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136) ~[LoadController.class:?]
1123 | at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:629) ~[Loader.class:?]
1124 | at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99) ~[FMLServerHandler.class:?]
1125 | at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333) ~[FMLCommonHandler.class:?]
1126 | at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125) ~[nz.class:?]
1127 | at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) ~[MinecraftServer.class:?]
1128 | at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_222]
1129 | Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@5f212d84 from coremod FMLCorePlugin
1130 | at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:260) ~[forge.jar:?]
1131 | at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
1132 | at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
1133 | at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_222]
1134 | at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_222]
1135 | at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_222]
1136 | at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[?:1.8.0_222]
1137 | at java.lang.Class.getConstructor0(Class.java:3075) ~[?:1.8.0_222]
1138 | at java.lang.Class.getDeclaredConstructor(Class.java:2178) ~[?:1.8.0_222]
1139 | at net.ilexiconn.llibrary.server.network.NetworkHandler.registerMessage(NetworkHandler.java:39) ~[NetworkHandler.class:?]
1140 | at net.ilexiconn.llibrary.server.network.NetworkHandler.injectNetworkWrapper(NetworkHandler.java:84) ~[NetworkHandler.class:?]
1141 | at net.ilexiconn.llibrary.LLibrary.onPreInit(LLibrary.java:85) ~[LLibrary.class:?]
1142 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1143 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1144 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1145 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1146 | at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:637) ~[forge.jar:?]
1147 | at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source) ~[?:?]
1148 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1149 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1150 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1151 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1152 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1153 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1154 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1155 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1156 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1157 | at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) ~[forge.jar:?]
1158 | at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[forge.jar:?]
1159 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1160 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1161 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1162 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1163 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1164 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1165 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1166 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1167 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1168 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1169 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1170 | at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136) ~[LoadController.class:?]
1171 | at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:629) ~[Loader.class:?]
1172 | at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99) ~[FMLServerHandler.class:?]
1173 | at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333) ~[FMLCommonHandler.class:?]
1174 | at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125) ~[nz.class:?]
1175 | at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) ~[MinecraftServer.class:?]
1176 | at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_222]
1177 | Caused by: java.lang.RuntimeException: Attempted to load class bud for invalid side SERVER
1178 | at net.minecraftforge.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:62) ~[forge.jar:?]
1179 | at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:256) ~[forge.jar:?]
1180 | at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
1181 | at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
1182 | at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_222]
1183 | at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_222]
1184 | at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_222]
1185 | at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[?:1.8.0_222]
1186 | at java.lang.Class.getConstructor0(Class.java:3075) ~[?:1.8.0_222]
1187 | at java.lang.Class.getDeclaredConstructor(Class.java:2178) ~[?:1.8.0_222]
1188 | at net.ilexiconn.llibrary.server.network.NetworkHandler.registerMessage(NetworkHandler.java:39) ~[NetworkHandler.class:?]
1189 | at net.ilexiconn.llibrary.server.network.NetworkHandler.injectNetworkWrapper(NetworkHandler.java:84) ~[NetworkHandler.class:?]
1190 | at net.ilexiconn.llibrary.LLibrary.onPreInit(LLibrary.java:85) ~[LLibrary.class:?]
1191 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1192 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1193 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1194 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1195 | at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:637) ~[forge.jar:?]
1196 | at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source) ~[?:?]
1197 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1198 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1199 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1200 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1201 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1202 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1203 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1204 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1205 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1206 | at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) ~[forge.jar:?]
1207 | at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[forge.jar:?]
1208 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
1209 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
1210 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
1211 | at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
1212 | at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
1213 | at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
1214 | at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
1215 | at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
1216 | at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
1217 | at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
1218 | at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
1219 | at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136) ~[LoadController.class:?]
1220 | at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:629) ~[Loader.class:?]
1221 | at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99) ~[FMLServerHandler.class:?]
1222 | at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333) ~[FMLCommonHandler.class:?]
1223 | at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125) ~[nz.class:?]
1224 | at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) ~[MinecraftServer.class:?]
1225 | at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_222]
1226 | [09:43:49] [Server thread/ERROR] [net.minecraft.server.MinecraftServer]: This crash report has been saved to: /aternos/server/./crash-reports/crash-2020-04-14_09.43.49-server.txt
1227

Do anyone know how to fix this. Im running MC 1.12.2 Forge 14.23.5.2847
Let me know if i require to send the entire log.