[11:23:48 WARN]: Task #6 for SMP5 v1.0-SNAPSHOT generated an exception
java.lang.NullPointerException: null
    at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:889) ~[guava-31.1-jre.jar:?]
    at net.citizensnpcs.trait.SkinTrait.setSkinPersistent(SkinTrait.java:159) ~[Citizens-2.0.31-b3004.jar:?]
    at com.stiggles.smp5.entity.npc.StigglesNPC.setSkin(StigglesNPC.java:129) ~[smp5.jar:?]
    at com.stiggles.smp5.entity.npc.dialoguenpc.Ned.<init>(Ned.java:15) ~[smp5.jar:?]
    at com.stiggles.smp5.main.SMP5.createNPCs(SMP5.java:214) ~[smp5.jar:?]
    at com.stiggles.smp5.main.SMP5$1.run(SMP5.java:138) ~[smp5.jar:?]
    at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftTask.run(CraftTask.java:101) ~[paper-1.19.4.jar:git-Paper-482]
    at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[paper-1.19.4.jar:git-Paper-482]
    at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1483) ~[paper-1.19.4.jar:git-Paper-482]
    at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:447) ~[paper-1.19.4.jar:git-Paper-482]
    at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1397) ~[paper-1.19.4.jar:git-Paper-482]
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1174) ~[paper-1.19.4.jar:git-Paper-482]
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:320) ~[paper-1.19.4.jar:git-Paper-482]
    at java.lang.Thread.run(Thread.java:1589) ~[?:?]