Crash on startup when using slimeworldmanager-classmodifier as the java agent

[josua27176]

Describe the issue
When I got to start the server with Slime World Manager's class modifier jar it crashes on startup but as soon as I remove the class modifier jar from the startup it starts up fine.
Spigot version
1.12.2
Plugin version
2.2.1
How to reproduce
Add -javaagent: slimeworldmanager-classmodifier.jar to the command line with Slime world managers plugin also in the plugins folder.
Crash reports (if available)

Description: Exception in server tick loop

java.lang.NoClassDefFoundError: amv
at net.minecraft.server.management.PlayerList.(PlayerList.java:133)
at net.minecraft.server.dedicated.DedicatedPlayerList.(SourceFile:14)
at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:228)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:596)
at java.lang.Thread.run(Thread.java:748)

[Paul19988]

Are you running Paper spigot or regular spigot,

Could you provide your full startup parameters,

Pictures of your root and plugin folders would also be ideal

[CraftDream]

i also have this problem.
Spigot1.12.2

[Paul19988]

https://cdn.discordapp.com/attachments/618535460729389061/754269237698101388/slimeworldmanager-plugin-2.3.0-SNAPSHOT.jar

https://cdn.discordapp.com/attachments/618535460729389061/754432455364313190/slimeworldmanager-classmodifier-2.3.0-SNAPSHOT.jar

Please use these versions from the Discord announcements channel

[CraftDream]

the same problem

Encountered an unexpected exception
java.lang.NoClassDefFoundError: ain
        at net.minecraft.server.management.PlayerList.initCraftServer(PlayerList.java:136) ~[pl.class:?]
        at net.minecraft.server.MinecraftServer.func_184105_a(MinecraftServer.java:1388) ~[MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:226) ~[nz.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:593) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]

[josua27176]

Everything seems to have loaded now but I cant seem to create a world or anything.

[09:04:42] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Josua27176 issued server command: /swm create TES mysql
[09:04:42] [Craft Scheduler Thread - 5/INFO] []: ?9[SWM] ?7Creating empty world TES.
[09:04:42] [Craft Scheduler Thread - 5/INFO] []: ?9[SWM] ?7World TES created in 190ms.
[09:04:42] [Server thread/WARN] [com.grinderwolf.swm.plugin.SWMPlugin]: [SlimeWorldManager] Task #744 for SlimeWorldManager v2.3.0-SNAPSHOT generated an exception
java.lang.NullPointerException: null
at org.bukkit.Location.getBlock(Location.java:91) ~[Location.class:1bc8635]
at com.grinderwolf.swm.plugin.commands.sub.CreateWorldCmd.lambda$onCommand$0(CreateWorldCmd.java:93) ~[?:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:65) ~[CraftTask.class:1bc8635]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:429) [CraftScheduler.class:1bc8635]
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:917) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:461) [nz.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:865) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:737) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_275]
[09:04:42] [Server thread/ERROR] [global]: TIMING_STACK_CORRUPTION - Report this to the plugin SlimeWorldManager(Look for errors above this in the logs) (TimingIdentifier{id=SlimeWorldManager:Task: com.grinderwolf.swm.plugin.commands.sub.CreateWorldCmd$$Lambda$33987/42369913 (Single)} did not stopTiming)
java.lang.Throwable: null