Server crash

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[Pterodactyl Daemon] Server marked as STARTING
[Pterodactyl Daemon] Checking size of server data directory...
[Pterodactyl Daemon] Disk Usage: 226M / 10000M
[Pterodactyl Daemon] Ensuring file permissions.
[Pterodactyl Daemon] Running server preflight.
[Pterodactyl Daemon] Starting server container.
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
:/home/container$ java -Xms128M -Xmx12000M -jar server.jar
Loading libraries, please wait...
Failed to start the minecraft server
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213) ~[server.jar:git-Spigot-f94fe8f-d27e6d0]
at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767) ~[server.jar:git-Spigot-f94fe8f-d27e6d0]
at com.google.common.collect.Lists.reverse(Lists.java:759) ~[server.jar:git-Spigot-f94fe8f-d27e6d0]
at net.minecraft.server.v1_8_R3.UserCache.b(UserCache.java:191) ~[server.jar:git-Spigot-f94fe8f-d27e6d0]
at net.minecraft.server.v1_8_R3.UserCache.<init>(UserCache.java:70) ~[server.jar:git-Spigot-f94fe8f-d27e6d0]
at net.minecraft.server.v1_8_R3.MinecraftServer.<init>(MinecraftServer.java:132) ~[server.jar:git-Spigot-f94fe8f-d27e6d0]
at net.minecraft.server.v1_8_R3.DedicatedServer.<init>(DedicatedServer.java:43) ~[server.jar:git-Spigot-f94fe8f-d27e6d0]
at net.minecraft.server.v1_8_R3.MinecraftServer.main(MinecraftServer.java:922) [server.jar:git-Spigot-f94fe8f-d27e6d0]
at org.bukkit.craftbukkit.Main.main(Main.java:193) [server.jar:git-Spigot-f94fe8f-d27e6d0]
[Pterodactyl Daemon] Server marked as OFF