Hello! I seem to be having issues with my minecraft 1.15.2 server. I'm guessing the issue is Forge and not Java. I'd appreciate help. Thanks in advance.

 

Description: Exception in server tick loop

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:611) [?:?] {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$2578/0x00000008013f9440@51aae12
    at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:194) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:161) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:156) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:151) ~[eventbus-2.0.0-milestone.1-service.jar:?] {}
    at net.minecraftforge.fml.network.NetworkInstance.addListener(NetworkInstance.java:65) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.network.simple.SimpleChannel.<init>(SimpleChannel.java:56) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.network.simple.SimpleChannel.<init>(SimpleChannel.java:49) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.network.NetworkRegistry$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

A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 13.0.2, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode, sharing), Oracle Corporation
    Memory: 3398131200 bytes (3240 MB) / 4294967296 bytes (4096 MB) up to 4294967296 bytes (4096 MB)
    CPUs: 4
    JVM Flags: 2 total; -Xmx4096M -Xms4096M
    Data Packs: 
    Is Modded: Definitely; Server brand changed to 'forge'
    Type: Dedicated Server (map_server.txt)

12 minutes ago, Kristina said:

Java Version: 13.0.2, Oracle Corporation

Try using Java 8