[21:50:40] [Server thread/ERROR]: Error occurred while enabling Multiverse-Core v4.1.1-SNAPSHOT-b777 (Is it up to date?)
java.lang.NullPointerException: null
at com.onarandombox.buscript.ScriptManager.(ScriptManager.java:31) ~[?:?]
at com.onarandombox.buscript.Buscript.(Buscript.java:77) ~[?:?]
at com.onarandombox.buscript.Buscript.(Buscript.java:65) ~[?:?]
at com.onarandombox.MultiverseCore.MultiverseCore.initializeBuscript(MultiverseCore.java:353) ~[?:?]
at com.onarandombox.MultiverseCore.MultiverseCore.onEnable(MultiverseCore.java:337) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.15.2.jar:git-Paper-378]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:380) ~[patched_1.15.2.jar:git-Paper-378]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:483) ~[patched_1.15.2.jar:git-Paper-378]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugin(CraftServer.java:472) ~[patched_1.15.2.jar:git-Paper-378]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugins(CraftServer.java:386) ~[patched_1.15.2.jar:git-Paper-378]
at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:488) ~[patched_1.15.2.jar:git-Paper-378]
at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:298) ~[patched_1.15.2.jar:git-Paper-378]
at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:908) ~[patched_1.15.2.jar:git-Paper-378]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
[21:50:40] [Server thread/INFO]: [Multiverse-Core] Disabling Multiverse-Core v4.1.1-SNAPSHOT-b777

I'm closing this as a duplicate of #2215. There's a build in that issues that that works around this issue.