[17:11:48 ERROR]: Error occurred while enabling AuctionHouse v1.0.1 (Is it up to date?)
java.lang.IllegalArgumentException: Material cannot be null
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145) ~[guava-31.0.1-jre.jar:?]
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:85) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:73) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:60) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
        at de.cubeisland.AuctionHouse.AuctionHouseConfiguration.getItemList(AuctionHouseConfiguration.java:93) ~[AuctionHouse.jar:?]
        at de.cubeisland.AuctionHouse.AuctionHouseConfiguration.<init>(AuctionHouseConfiguration.java:63) ~[AuctionHouse.jar:?]
        at de.cubeisland.AuctionHouse.AuctionHouse.onEnable(AuctionHouse.java:73) ~[AuctionHouse.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:542) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_19_R1.CraftServer.enablePlugin(CraftServer.java:563) ~[paper-1.19.jar:git-Paper-81]
        at org.bukkit.craftbukkit.v1_19_R1.CraftServer.enablePlugins(CraftServer.java:477) ~[paper-1.19.jar:git-Paper-81]
        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:634) ~[paper-1.19.jar:git-Paper-81]
        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:420) ~[paper-1.19.jar:git-Paper-81]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:306) ~[paper-1.19.jar:git-Paper-81]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1122) ~[paper-1.19.jar:git-Paper-81]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:303) ~[paper-1.19.jar:git-Paper-81]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]