[17:38:35] [Server thread/ERROR]: Error occurred while enabling MMOItems v5.5.4 (Is it up to date?)
java.lang.NullPointerException: null
    at org.black_ixx.bossshop.core.rewards.BSRewardType.registerType(BSRewardType.java:60) ~[?:?]
    at org.black_ixx.bossshop.core.rewards.BSRewardType.register(BSRewardType.java:91) ~[?:?]
    at net.Indyuce.mmoitems.MMOItems.onEnable(MMOItems.java:248) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.16.1.jar:git-Paper-101]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:380) ~[patched_1.16.1.jar:git-Paper-101]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:483) ~[patched_1.16.1.jar:git-Paper-101]
    at org.bukkit.craftbukkit.v1_16_R1.CraftServer.enablePlugin(CraftServer.java:500) ~[patched_1.16.1.jar:git-Paper-101]
    at org.bukkit.craftbukkit.v1_16_R1.CraftServer.enablePlugins(CraftServer.java:414) ~[patched_1.16.1.jar:git-Paper-101]
    at net.minecraft.server.v1_16_R1.MinecraftServer.loadWorld(MinecraftServer.java:471) ~[patched_1.16.1.jar:git-Paper-101]
    at net.minecraft.server.v1_16_R1.DedicatedServer.init(DedicatedServer.java:241) ~[patched_1.16.1.jar:git-Paper-101]
    at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:940) ~[patched_1.16.1.jar:git-Paper-101]
    at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$a$0(MinecraftServer.java:177) ~[patched_1.16.1.jar:git-Paper-101]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]
[17:38:35] [Server thread/INFO]: [MMOItems] Disabling MMOItems v5.5.4