I’m not too sure what it is, but I provided the cmd log from when it crashed.
[11:20:04] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from SpongeForge (spongeforge)
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/common/ForgeChunkManager$Ticket
at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_241]
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getConstructor0(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getConstructor(Unknown Source) ~[?:1.8.0_241]
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:128) ~[EventBus.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:112) ~[EventBus.class:?]
at org.spongepowered.mod.SpongeMod.onPreInit(SpongeMod.java:442) ~[SpongeMod.class:1.12.2-2838-7.2.0]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_241]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) ~[LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[LoadController.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_241]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.LoadController.redirect$zza000$forgeImpl$PostEvent(LoadController.java:568) ~[LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136) ~[LoadController.class:?]
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:627) ~[Loader.class:?]
at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99) ~[FMLServerHandler.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333) ~[FMLCommonHandler.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125) ~[nz.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.common.ForgeChunkManager$Ticket
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_241]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_241]
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getConstructor0(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getConstructor(Unknown Source) ~[?:1.8.0_241]
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:128) ~[EventBus.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:112) ~[EventBus.class:?]
at org.spongepowered.mod.SpongeMod.onPreInit(SpongeMod.java:442) ~[SpongeMod.class:1.12.2-2838-7.2.0]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_241]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) ~[LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[LoadController.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_241]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.LoadController.redirect$zza000$forgeImpl$PostEvent(LoadController.java:568) ~[LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136) ~[LoadController.class:?]
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:627) ~[Loader.class:?]
at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99) ~[FMLServerHandler.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333) ~[FMLCommonHandler.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125) ~[nz.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) ~[MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) ~[?:1.8.0_241]
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.util.jar.Attributes.<init>(Unknown Source) ~[?:1.8.0_241]
at java.util.jar.Attributes.clone(Unknown Source) ~[?:1.8.0_241]
at sun.net.www.protocol.jar.URLJarFile.getManifest(Unknown Source) ~[?:1.8.0_241]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:147) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_241]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_241]
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getConstructor0(Unknown Source) ~[?:1.8.0_241]
at java.lang.Class.getConstructor(Unknown Source) ~[?:1.8.0_241]
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:128) ~[EventBus.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:112) ~[EventBus.class:?]
at org.spongepowered.mod.SpongeMod.onPreInit(SpongeMod.java:442) ~[SpongeMod.class:1.12.2-2838-7.2.0]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_241]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[minecraft_server.1.12.2.jar:?]
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) ~[LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[LoadController.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_241]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[minecraft_server.1.12.2.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[minecraft_server.1.12.2.jar:?]
[11:20:25] [Server thread/INFO] [STDOUT]: [net.minecraft.crash.CrashReport:func_85057_a:300]: Negative index in crash report handler (0/5)
[11:20:28] [Server thread/ERROR] [minecraft/CrashReport]: Could not save crash report to .\crash-reports\crash-2020-04-13_11.20.26-server.txt
java.lang.OutOfMemoryError: Java heap space
[11:20:28] [Server thread/ERROR] [minecraft/MinecraftServer]: We were unable to save this crash report to disk.
[11:20:28] [Server thread/INFO] [minecraft/MinecraftServer]: Stopping server
[11:20:29] [Server thread/INFO] [minecraft/MinecraftServer]: Saving worlds
[11:20:30] [Server thread/INFO] [FML]: The state engine was in incorrect state INITIALIZATION and forced into state SERVER_STOPPED. Errors may have been discarded.
2020-04-13 11:20:34,812 Server Shutdown Thread ERROR An exception occurred processing Appender Console java.lang.IllegalStateException
at org.jline.reader.impl.LineReaderImpl.callWidget(LineReaderImpl.java:651)
at net.minecraftforge.server.terminalconsole.TerminalConsoleAppender.append(TerminalConsoleAppender.java:308)
at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)
at org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:439)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:434)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:403)
at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2091)
at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:1988)
at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1960)
at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1297)
at net.minecraft.server.MinecraftServer.func_71260_j(MinecraftServer.java:6891)
at net.minecraft.server.MinecraftServer$4.run(MinecraftServer.java:1579)