Possible compatibility issue with ChestCommands

[Mikedeejay2]

A user on SpigotMC is having issues between SimpleStack and ChestCommands. When SimpleStack is installed, ChestCommands does not launch.

Stacktrace

EpicCraftingsPlus] Enabling EpicCraftingsPlus v6.6.4
[04:09:50] [Thread-13/WARN]: java.lang.IllegalStateException: zip file closed
[04:09:50] [Thread-13/WARN]: at java.base/java.util.zip.ZipFile.ensureOpen(ZipFile.java:829)
[04:09:50] [Thread-13/WARN]: at java.base/java.util.zip.ZipFile.getEntry(ZipFile.java:328)
[04:09:50] [Thread-13/WARN]: at java.base/java.util.jar.JarFile.getEntry(JarFile.java:519)
[04:09:50] [Thread-13/WARN]: at java.base/java.util.jar.JarFile.getJarEntry(JarFile.java:474)
[04:09:50] [Thread-13/WARN]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:168)
[04:09:50] [Thread-13/WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:586)
[04:09:50] [Thread-13/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:119)
[04:09:50] [Thread-13/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:114)
[04:09:50] [Thread-13/WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
[04:09:50] [Thread-13/WARN]: at com.gmail.filoghost.chestcommands.SimpleUpdater$1.run(SimpleUpdater.java:77)
[04:09:50] [Thread-13/WARN]: at java.base/java.lang.Thread.run(Thread.java:831)
[04:09:50] [Thread-13/WARN]: [ChestCommands] Unable to check for updates: unhandled exception.
[04:09:50] [Server thread/INFO]: ----------[EpicCraftingsPlus]---------
[04:09:50] [Server thread/INFO


ChestCommands] Enabling ChestCommands v3.3.1
[04:09:50] [Server thread/INFO]: [ChestCommands] Hooked PlaceholderAPI
[04:09:50] [Server thread/ERROR]: Error occurred while enabling ChestCommands v3.3.1 (Is it up to date?)
java.lang.ExceptionInInitializerError: null
at com.gmail.filoghost.chestcommands.serializer.IconSerializer.loadIconFromSection(IconSerializer.java:144) ~[?:?]
at com.gmail.filoghost.chestcommands.serializer.MenuSerializer.loadMenu(MenuSerializer.java:65) ~[?:?]
at com.gmail.filoghost.chestcommands.ChestCommands.load(ChestCommands.java:214) ~[?:?]
at com.gmail.filoghost.chestcommands.ChestCommands.onEnable(ChestCommands.java:130) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.16.5.jar:git-Airplane-12]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370) ~[patched_1.16.5.jar:git-Airplane-12]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:500) ~[patched_1.16.5.jar:git-Airplane-12]
at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:518) ~[patched_1.16.5.jar:git-Airplane-12]
at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:432) ~[patched_1.16.5.jar:git-Airplane-12]
at net.minecraft.server.v1_16_R3.MinecraftServer.loadWorld(MinecraftServer.java:600) ~[patched_1.16.5.jar:git-Airplane-12]
at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:301) ~[patched_1.16.5.jar:git-Airplane-12]
at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1076) ~[patched_1.16.5.jar:git-Airplane-12]
at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:292) ~[patched_1.16.5.jar:git-Airplane-12]
at java.lang.Thread.run(Thread.java:831) [?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "String.toLowerCase()" because the return value of "com.gmail.filoghost.chestcommands.util.StringUtils.stripChars(String, String)" is null
at com.gmail.filoghost.chestcommands.serializer.EnchantmentSerializer.formatLowercase(EnchantmentSerializer.java:63) ~[?:?]
at com.gmail.filoghost.chestcommands.serializer.EnchantmentSerializer.<clinit>(EnchantmentSerializer.java:57) ~[?:?]
... 14 more
[04:09:50] [Server thread/INFO]: [ChestCommands] Disabling ChestCommands v3.3.1