I did not edit any configuration files.

[01:20:24 ERROR]: There's an incorrect configuration in the race: Sentinel. Please correct it. If the race is not the problem, inspect the class: Swordmaster. It could be the source of the issue.
[01:20:24 WARN]: java.lang.IndexOutOfBoundsException: Index 3 out of bounds for length 3
[01:20:24 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
[01:20:24 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
[01:20:24 WARN]: at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
[01:20:24 WARN]: at java.base/java.util.Objects.checkIndex(Objects.java:359)
[01:20:24 WARN]: at java.base/java.util.ArrayList.get(ArrayList.java:427)
[01:20:24 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.other.h.a(Unknown Source)
[01:20:24 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.a.run(Unknown Source)
[01:20:24 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftTask.run(CraftTask.java:101)
[01:20:24 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:480)
[01:20:24 WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1479)
[01:20:24 WARN]: at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:446)
[01:20:24 WARN]: at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1393)
[01:20:24 WARN]: at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1170)
[01:20:24 WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317)
[01:20:24 WARN]: at java.base/java.lang.Thread.run(Thread.java:833)
[01:20:27 ERROR]: There's an incorrect configuration in the race: Sentinel. Please correct it. If the race is not the problem, inspect the class: Swordmaster. It could be the source of the issue.
[01:20:27 WARN]: java.lang.IndexOutOfBoundsException: Index 3 out of bounds for length 3
[01:20:27 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
[01:20:27 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
[01:20:27 WARN]: at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
[01:20:27 WARN]: at java.base/java.util.Objects.checkIndex(Objects.java:359)
[01:20:27 WARN]: at java.base/java.util.ArrayList.get(ArrayList.java:427)
[01:20:27 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.other.h.a(Unknown Source)
[01:20:27 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.a.run(Unknown Source)
[01:20:27 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftTask.run(CraftTask.java:101)
[01:20:27 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:480)
[01:20:27 WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1479)
[01:20:27 WARN]: at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:446)
[01:20:27 WARN]: at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1393)
[01:20:27 WARN]: at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1170)
[01:20:27 WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317)
[01:20:27 WARN]: at java.base/java.lang.Thread.run(Thread.java:833)
[01:20:30 ERROR]: There's an incorrect configuration in the race: Sentinel. Please correct it. If the race is not the problem, inspect the class: Swordmaster. It could be the source of the issue.
[01:20:30 WARN]: java.lang.IndexOutOfBoundsException: Index 3 out of bounds for length 3
[01:20:30 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
[01:20:30 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
[01:20:30 WARN]: at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
[01:20:30 WARN]: at java.base/java.util.Objects.checkIndex(Objects.java:359)
[01:20:30 WARN]: at java.base/java.util.ArrayList.get(ArrayList.java:427)
[01:20:30 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.other.h.a(Unknown Source)
[01:20:30 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.a.run(Unknown Source)
[01:20:30 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftTask.run(CraftTask.java:101)
[01:20:30 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:480)
[01:20:30 WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1479)
[01:20:30 WARN]: at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:446)
[01:20:30 WARN]: at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1393)
[01:20:30 WARN]: at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1170)
[01:20:30 WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317)
[01:20:30 WARN]: at java.base/java.lang.Thread.run(Thread.java:833)
[01:20:34 INFO]: [LP] sly9909 already inherits from immortal in context global.
[01:20:36 ERROR]: There's an incorrect configuration in the race: Sentinel. Please correct it. If the race is not the problem, inspect the class: Swordmaster. It could be the source of the issue.
[01:20:36 WARN]: java.lang.IndexOutOfBoundsException: Index 3 out of bounds for length 3
[01:20:36 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
[01:20:36 WARN]: at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
[01:20:36 WARN]: at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
[01:20:36 WARN]: at java.base/java.util.Objects.checkIndex(Objects.java:359)
[01:20:36 WARN]: at java.base/java.util.ArrayList.get(ArrayList.java:427)
[01:20:36 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.other.h.a(Unknown Source)
[01:20:36 WARN]: at MythicalRaces-2.3.8-SE-V1-out.jar//src.me.korbsti.mythicalraces.a.run(Unknown Source)
[01:20:36 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftTask.run(CraftTask.java:101)
[01:20:36 WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:480)
[01:20:36 WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1479)
[01:20:36 WARN]: at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:446)
[01:20:36 WARN]: at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1393)
[01:20:36 WARN]: at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1170)
[01:20:36 WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317)
[01:20:36 WARN]: at java.base/java.lang.Thread.run(Thread.java:833)
[01:20:39 ERROR]: There's an incorrect configuration in the race: Sentinel. Please correct it. If the race is not the problem, inspect the class: Swordmaster. It could be the source of the issue.

Youre not using the latest version, try deleting the MythicalRaces folder and restart, if not join the discord server and we can discuss more there