Attempting to start the 2.11 version resulted in this error, even after erasing the ChestsPlusPlus directory.

[20:07:52] [Server thread/WARN]: [ChestsPlusPlus] Task #2460 for ChestsPlusPlus v2.11-Release generated an exception
java.lang.IllegalArgumentException: Recipe must have non-AIR result.
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:143) ~[guava-32.1.2-jre.jar:?]
at org.bukkit.inventory.CraftingRecipe.(CraftingRecipe.java:21) ~[purpur-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.inventory.ShapedRecipe.(ShapedRecipe.java:49) ~[purpur-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.inventory.CraftShapedRecipe.(CraftShapedRecipe.java:21) ~[purpur-1.20.4.jar:git-Purpur-2144]
at org.bukkit.craftbukkit.v1_20_R3.inventory.CraftShapedRecipe.(CraftShapedRecipe.java:25) ~[purpur-1.20.4.jar:git-Purpur-2144]
at net.minecraft.world.item.crafting.ShapedRecipe.toBukkitRecipe(ShapedRecipe.java:45) ~[?:?]
at net.minecraft.world.item.crafting.ShapedRecipe.toBukkitRecipe(ShapedRecipe.java:20) ~[?:?]
at net.minecraft.world.item.crafting.RecipeHolder.toBukkitRecipe(RecipeHolder.java:11) ~[purpur-1.20.4.jar:git-Purpur-2144]
at org.bukkit.craftbukkit.v1_20_R3.inventory.RecipeIterator.next(RecipeIterator.java:47) ~[purpur-1.20.4.jar:git-Purpur-2144]
at org.bukkit.craftbukkit.v1_20_R3.inventory.RecipeIterator.next(RecipeIterator.java:13) ~[purpur-1.20.4.jar:git-Purpur-2144]
at java.util.Iterator.forEachRemaining(Iterator.java:133) ~[?:?]
at com.jamesdpeters.minecraft.chests.crafting.Crafting.load(Crafting.java:25) ~[ChestsPlusPlus-2.11-Release.jar:?]
at com.jamesdpeters.minecraft.chests.ChestsPlusPlus.lambda$onEnable$4(ChestsPlusPlus.java:132) ~[ChestsPlusPlus-2.11-Release.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftTask.run(CraftTask.java:101) ~[purpur-1.20.4.jar:git-Purpur-2144]
at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:482) ~[purpur-1.20.4.jar:git-Purpur-2144]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1157) ~[purpur-1.20.4.jar:git-Purpur-2144]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323) ~[purpur-1.20.4.jar:git-Purpur-2144]
at java.lang.Thread.run(Thread.java:840) ~[?:?]

Paste of full log:
https://paste.longwing.us/wyIKK

adding here, looks like 2.10 had the same issue, I reverted back hoping it would work, but still an issue.

Looks like another plugin is at fault for the recipe being present, however this error is breaking the plugin's ability to function.