Tried running Forge 1.15 server on my MacOS 10.13.6. Java 8 Update 251 installed but still receiving this error:
Last login: Tue Apr 21 20:07:04 on console
Ye-Fengs-MacBook-Pro-2011:~ ongyefeng$ /Users/ongyefeng/Desktop/Forge15/start.command ; exit;
[20:08:03] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--gameDir, ., --launchTarget, fmlserver, --fml.forgeVersion, 31.1.19, --fml.mcpVersion, 20200122.131323, --fml.mcVersion, 1.15.2, --fml.forgeGroup, net.minecraftforge, nogui]
[20:08:03] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 5.0.0-milestone.4+67+b1a340b starting: java version 13.0.1 by Oracle Corporation
[20:08:05] [main/INFO] [ne.mi.fm.lo.FixSSL/CORE]: Added Lets Encrypt root certificates as additional trust
[20:08:08] [main/INFO] [STDERR/]: [jdk.nashorn.api.scripting.NashornScriptEngine:<init>:143]: Warning: Nashorn engine is planned to be removed from a future JDK release
[20:08:08] [main/INFO] [STDERR/]: [jdk.nashorn.api.scripting.NashornScriptEngine:<init>:143]: Warning: Nashorn engine is planned to be removed from a future JDK release
[20:08:11] [main/INFO] [cp.mo.mo.LaunchServiceHandler/MODLAUNCHER]: Launching target 'fmlserver' with arguments [--gameDir, ., nogui]
[Serene Seasons Transformer]: Transforming func_201854_a in net/minecraft/world/biome/Biome
[Serene Seasons Transformer]: Patched 1 calls
[Serene Seasons Transformer]: Transforming func_201850_b in net/minecraft/world/biome/Biome
[Serene Seasons Transformer]: Patched 1 calls
[Serene Seasons Transformer]: Transforming func_176224_k in net/minecraft/block/CauldronBlock
[Serene Seasons Transformer]: Patched 1 calls
[Serene Seasons Transformer]: Transforming func_70636_d in net/minecraft/entity/passive/SnowGolemEntity
[Serene Seasons Transformer]: Patched 2 calls
[20:08:51] [main/WARN] [minecraft/Commands]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]
[20:08:51] [main/WARN] [minecraft/Commands]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[20:08:51] [main/WARN] [minecraft/Commands]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]
[20:08:51] [main/WARN] [minecraft/Commands]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]
[20:08:52] [main/WARN] [minecraft/Commands]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[20:08:52] [Server thread/INFO] [minecraft/DedicatedServer]: Starting minecraft server version 1.15.2
[20:08:54] [Server thread/ERROR] [ne.mi.ev.EventBus/EVENTBUS]: Failed to resolve handler for "net.minecraftforge.fml.network.simple.SimpleChannel$$Lambda$2768/0x000000080145e840@d405733"
[20:08:54] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
java.lang.ExceptionInInitializerError: null
at net.minecraftforge.fml.ModLoader.<init>(ModLoader.java:121) ~[?:?] {re:classloading}
at net.minecraftforge.fml.ModLoader.get(ModLoader.java:146) ~[?:?] {re:classloading}
at net.minecraftforge.fml.server.ServerModLoader.begin(ServerModLoader.java:45) ~[?:?] {re:classloading}
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:122) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:613) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Thread.java:830) [?:?] {}
Caused by: java.lang.IllegalStateException: Failed to resolve consumer event type: net.minecraftforge.fml.network.simple.SimpleChannel$$Lambda$2768/0x000000080145e840@d405733
at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:194) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:161) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:156) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:151) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
at net.minecraftforge.fml.network.NetworkInstance.addListener(NetworkInstance.java:65) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.simple.SimpleChannel.<init>(SimpleChannel.java:57) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.simple.SimpleChannel.<init>(SimpleChannel.java:50) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.NetworkRegistry$ChannelBuilder.simpleChannel(NetworkRegistry.java:409) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.NetworkInitialization.getHandshakeChannel(NetworkInitialization.java:38) ~[?:?] {re:classloading}
at net.minecraftforge.fml.network.FMLNetworkConstants.<clinit>(FMLNetworkConstants.java:48) ~[?:?] {re:classloading}
... 6 more
[20:08:54] [Server thread/ERROR] [minecraft/MinecraftServer]: This crash report has been saved to: /Users/ongyefeng/Desktop/Forge15/./crash-reports/crash-2020-04-21_20.08.54-server.txt
[20:08:55] [Server thread/INFO] [minecraft/MinecraftServer]: Stopping server
[20:08:55] [Server thread/INFO] [minecraft/MinecraftServer]: Saving worlds
[20:08:55] [Server thread/ERROR] [minecraft/MinecraftServer]: Exception stopping the server
java.lang.IllegalArgumentException: Can not hotload overworld. This must be loaded at all times by main Server.
at org.apache.commons.lang3.Validate.isTrue(Validate.java:158) ~[server-1.15.2-extra.jar:?] {}
at net.minecraftforge.common.DimensionManager.initWorld(DimensionManager.java:229) ~[?:?] {re:classloading}
at net.minecraftforge.common.DimensionManager.getWorld(DimensionManager.java:198) ~[?:?] {re:classloading}
at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:1004) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_213211_a(MinecraftServer.java:536) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_71260_j(MinecraftServer.java:568) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.dedicated.DedicatedServer.func_71260_j(DedicatedServer.java:549) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:676) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Thread.java:830) [?:?] {}
> logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
[Process completed]
