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When testing out the first dungeon that I made, I used the command /md play {dungeon} and I would load into the dungeon for a split second, I would see it, then I would return to the place of origin and the following error was sent to my console.

[19:04:52 WARN]: [MythicDungeons] Task #428679 for MythicDungeons v1.1.2-SNAPSHOT generated an exception java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "entities" is null at net.playavalon.mythicdungeons.dungeons.Instance.lambda$dispose$4(Instance.java:438) ~[MythicDungeons-1.1.2-SNAPSHOT.jar:?] at net.playavalon.mythicdungeons.utility.ProcessTimer.run(ProcessTimer.java:9) ~[MythicDungeons-1.1.2-SNAPSHOT.jar:?] at net.playavalon.mythicdungeons.dungeons.Instance.dispose(Instance.java:430) ~[MythicDungeons-1.1.2-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftTask.run(CraftTask.java:101) ~[purpur-1.19.4.jar:git-Purpur-1985] at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[purpur-1.19.4.jar:git-Purpur-1985] at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1510) ~[purpur-1.19.4.jar:git-Purpur-1985] at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:488) ~[purpur-1.19.4.jar:git-Purpur-1985] at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1424) ~[purpur-1.19.4.jar:git-Purpur-1985] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1195) ~[purpur-1.19.4.jar:git-Purpur-1985] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:325) ~[purpur-1.19.4.jar:git-Purpur-1985] at java.lang.Thread.run(Thread.java:833) ~[?:?]

Other times, the same thing occurs in-game, but instead in the console, I get this message.

[21:19:30 INFO]: CafDad issued server command: /md play GoblinKing [21:19:31 INFO]: Preparing start region for dimension minecraft:goblinking_0 [21:19:31 INFO]: Time elapsed: 9 ms [21:19:31 INFO]: [WorldGuard] (GoblinKing_0) TNT ignition is PERMITTED. [21:19:31 INFO]: [WorldGuard] (GoblinKing_0) Lighters are PERMITTED. [21:19:31 INFO]: [WorldGuard] (GoblinKing_0) Lava fire is PERMITTED. [21:19:31 INFO]: [WorldGuard] (GoblinKing_0) Fire spread is UNRESTRICTED. [21:19:31 INFO]: [WorldGuard] Loaded configuration for world 'GoblinKing_0' [21:19:31 INFO]: [dynmap] World 'GoblinKing_0' disabled [21:19:31 INFO]: [MythicDungeons] -= Loading map GoblinKing_0 processed in 71ms. =- [21:19:31 INFO]: [MythicDungeons] -= Loading Dungeon GoblinKing processed in 214ms. =- [21:19:31 INFO]: [MythicDungeons] PLAYER FOUND [21:19:31 INFO]: [MythicDungeons] Cleaning up instance 'GoblinKing_0'... [21:19:31 WARN]: [Multiverse-Core] Hmm Multiverse does not know about this world but it's loaded in memory. [21:19:31 WARN]: [Multiverse-Core] To let Multiverse know about it, use: [21:19:31 WARN]: [Multiverse-Core] /mv import GoblinKing_0 NORMAL [21:19:31 INFO]: [ChunkHolderManager] Waiting 60s for chunk system to halt for world 'GoblinKing_0' [21:19:31 INFO]: [ChunkHolderManager] Halted chunk system for world 'GoblinKing_0' [21:19:31 INFO]: [MythicDungeons] -= Unloading world GoblinKing_0 processed in 22ms. =- [21:19:31 INFO]: [MythicDungeons] -= Cleaning up GoblinKing_0 processed in 25ms. =-

Here is my full console log for the first error, and then as you can see when I run the command again a second time, the second error code that I have shown above appears. Console Logs

Also, here is a youtube video explaining what I, or the player, sees in the game Youtube Video