Forge 1.15.2 Server Crashing on Startup

[BossyGalaxy]

I have a Ubuntu (19.10 32GB RAM & 8 Cores) running a Forge server (1.15.2-31.1.59) and every time I start the server up it crashes. I have not added any mods as yet in the mods folder.

 

I am running as the superusers so I don't believe it would be permissions. Is there anything that I am doing obviously wrong?

 

The Crash log is as follows:

 

Time: 27/04/2020, 15:25
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
    at net.minecraftforge.fml.loading.moddiscovery.BackgroundScanHandler.waitForScanToComplete(BackgroundScanHandler.java:97) ~[forge-1.15.2-31.1.59.jar:?] {}
    at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:178) ~[?:?] {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:834) [?:?] {}

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    Operating System: Linux (amd64) version 5.3.0-46-generic
    Java Version: 11.0.7, Ubuntu
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode, sharing), Ubuntu
    Memory: 1473734416 bytes (1405 MB) / 2348810240 bytes (2240 MB) up to 8420065280 bytes (8030 MB)
    CPUs: 8
    JVM Flags: 0 total; 
    ModLauncher: 5.1.0+69+master.79f13f7
    ModLauncher launch target: fmlserver
    ModLauncher naming: srg
    ModLauncher services: 
        /eventbus-2.1.0-service.jar eventbus PLUGINSERVICE 
        /forge-1.15.2-31.1.59.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.15.2-31.1.59.jar runtime_enum_extender PLUGINSERVICE 
        /forge-1.15.2-31.1.59.jar capability_inject_definalize PLUGINSERVICE 
        /accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.15.2-31.1.59.jar runtimedistcleaner PLUGINSERVICE 
        /forge-1.15.2-31.1.59.jar fml TRANSFORMATIONSERVICE 
    FML: 31.1
    Forge: net.minecraftforge:31.1.59
    FML Language Providers: 
        [email protected]
        minecraft@1
    Data Packs: 
    Is Modded: Definitely; Server brand changed to 'forge'
    Type: Dedicated Server (map_server.txt)

 

 

 

Log file contents:

 

[27Apr2020 15:25:03.578] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher running: args [--gameDir, ., --launchTarget, fmlserver, --fml.forgeVersion, 31.1.59, --fml.mcpVersion, 20200414.225201, --fml.mcVersion, 1.15.2, --fml.forgeGroup, net.minecraftforge]
[27Apr2020 15:25:03.584] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher 5.1.0+69+master.79f13f7 starting: java version 11.0.7 by Ubuntu
[27Apr2020 15:25:03.974] [main/INFO] [net.minecraftforge.fml.loading.FixSSL/CORE]: Added Lets Encrypt root certificates as additional trust
[27Apr2020 15:25:04.651] [main/INFO] [STDERR/]: [jdk.nashorn.api.scripting.NashornScriptEngine:<init>:143]: Warning: Nashorn engine is planned to be removed from a future JDK release
[27Apr2020 15:25:05.403] [main/INFO] [cpw.mods.modlauncher.LaunchServiceHandler/MODLAUNCHER]: Launching target 'fmlserver' with arguments [--gameDir, .]
[27Apr2020 15:25:20.896] [main/WARN] [net.minecraft.command.Commands/]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]
[27Apr2020 15:25:20.921] [main/WARN] [net.minecraft.command.Commands/]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[27Apr2020 15:25:20.924] [main/WARN] [net.minecraft.command.Commands/]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]
[27Apr2020 15:25:20.927] [main/WARN] [net.minecraft.command.Commands/]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]
[27Apr2020 15:25:20.936] [main/WARN] [net.minecraft.command.Commands/]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[27Apr2020 15:25:22.606] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: Starting minecraft server version 1.15.2
[27Apr2020 15:25:23.817] [Server thread/ERROR] [net.minecraft.server.MinecraftServer/]: Encountered an unexpected exception
java.lang.NullPointerException: null
    at net.minecraftforge.fml.loading.moddiscovery.BackgroundScanHandler.waitForScanToComplete(BackgroundScanHandler.java:97) ~[forge-1.15.2-31.1.59.jar:?]
    at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:178) ~[?:?]
    at net.minecraftforge.fml.server.ServerModLoader.begin(ServerModLoader.java:45) ~[?:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:122) ~[?:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:613) [?:?]
    at java.lang.Thread.run(Thread.java:834) [?:?]
[27Apr2020 15:25:23.906] [Server thread/ERROR] [net.minecraft.server.MinecraftServer/]: This crash report has been saved to: /home/administrator/Desktop/ForgeA/./crash-reports/crash-2020-04-27_15.25.23-server.txt
[27Apr2020 15:25:23.992] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: Stopping server
[27Apr2020 15:25:23.994] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: Saving worlds
[27Apr2020 15:25:24.033] [Server thread/ERROR] [net.minecraft.server.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) ~[?:?]
    at net.minecraftforge.common.DimensionManager.getWorld(DimensionManager.java:198) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:1004) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_213211_a(MinecraftServer.java:536) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_71260_j(MinecraftServer.java:568) ~[?:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71260_j(DedicatedServer.java:550) ~[?:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:676) [?:?]
    at java.lang.Thread.run(Thread.java:834) [?:?]

[BossyGalaxy]

Thank you very much this worked. I completely missed that thread.