Error logs enclosed.

[13:22:36 INFO]: [ChestsPlusPlus] Enabling ChestsPlusPlus v2.2.1-Release
[13:22:36 INFO]: [ChestsPlusPlus] Found API version: v1_16_R1
[13:22:36 INFO]: [ChestsPlusPlus] Chests++ enabled!
[13:22:36 INFO]: Server permissions file permissions.yml is empty, ignoring it
[13:22:36 INFO]: Done (5.143s)! For help, type "help"
[13:22:39 WARN]: [ChestsPlusPlus] Task #3 for ChestsPlusPlus v2.2.1-Release generated an exception
java.lang.IllegalArgumentException: Recipe must have non-AIR result.
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.inventory.ShapelessRecipe.(ShapelessRecipe.java:47) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.craftbukkit.v1_16_R1.inventory.CraftShapelessRecipe.(CraftShapelessRecipe.java:19) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.craftbukkit.v1_16_R1.inventory.CraftShapelessRecipe.(CraftShapelessRecipe.java:23) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.ShapelessRecipes.toBukkitRecipe(ShapelessRecipes.java:32) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.ShapelessRecipes.toBukkitRecipe(ShapelessRecipes.java:1) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.craftbukkit.v1_16_R1.inventory.RecipeIterator.next(RecipeIterator.java:31) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.craftbukkit.v1_16_R1.inventory.RecipeIterator.next(RecipeIterator.java:1) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at java.util.Iterator.forEachRemaining(Unknown Source) ~[?:1.8.0_261]
at com.jamesdpeters.minecraft.chests.crafting.Crafting.load(Crafting.java:27) ~[?:?]
at com.jamesdpeters.minecraft.chests.ChestsPlusPlus.lambda$onEnable$1(ChestsPlusPlus.java:142) ~[?:?]
at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftTask.run(CraftTask.java:81) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:400) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.b(MinecraftServer.java:1061) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.DedicatedServer.b(DedicatedServer.java:354) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.a(MinecraftServer.java:1009) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:848) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_261]
[13:22:40 INFO]: [ChestsPlusPlus] Plugin is up to date! Thank you for supporting Chests++!

And

org.bukkit.command.CommandException: Unhandled exception executing command 'cl' in plugin ChestsPlusPlus v2.2.1-Release
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at org.bukkit.craftbukkit.v1_16_R1.CraftServer.dispatchCommand(CraftServer.java:757) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.PlayerConnection.handleCommand(PlayerConnection.java:1703) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.PlayerConnection.a(PlayerConnection.java:1546) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.TickTask.run(SourceFile:18) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.executeTask(SourceFile:144) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.executeNext(SourceFile:118) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.aZ(MinecraftServer.java:943) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.executeNext(MinecraftServer.java:936) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.sleepForTick(MinecraftServer.java:920) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:852) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_261]
Caused by: java.lang.NullPointerException
at com.jamesdpeters.minecraft.chests.commands.ChestLinkCommand.onCommand(ChestLinkCommand.java:107) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot-1.16.1.jar:git-Spigot-9639cf7-8fb6585]
... 18 more

No part of chest++ functions.

Just did some troubleshooting and it your plugin runs fine with a new worldfile. Not sure why but my world was causing issues.

Do you use any plugins that add custom recipes at all? It seems like an autocraft recipe was added to the system with no output item. So either your config was corrupted or there was a bug with the autocrafting. Either way, I'll add a check for it so that it doesn't cause a crash 👍