Does anyone know what this is and how to fix this?

Edit: it was medieval makeshiftry.

My games keeps failing when making a world and I keep getting this error:

ERROR: General f:0> ScriptManager.PostWorldDictionaryInit> Exception thrown

java.lang.Exception: make\_bycocket\_plain item not found: base.mm\_bycocket\_plain at OutputMapper.getItem(OutputMapper.java:98).

Stack trace:

zombie.entity.components.crafting.recipe.OutputMapper.getItem(OutputMapper.java:98)

zombie.entity.components.crafting.recipe.OutputMapper.OnPostWorldDictionaryInit(OutputMapper.java:124)

zombie.scripting.entity.components.crafting.OutputScript.OnPostWorldDictionaryInit(OutputScript.java:445)

zombie.scripting.entity.components.crafting.CraftRecipe.OnPostWorldDictionaryInit(CraftRecipe.java:823)

zombie.scripting.ScriptBucketCollection.OnPostWorldDictionaryInit(ScriptBucketCollection.java:188)

zombie.scripting.ScriptManager.PostWorldDictionaryInit(ScriptManager.java:1666)

zombie.iso.IsoWorld.init(IsoWorld.java:2228)

zombie.gameStates.GameLoadingState$1.runInner(GameLoadingState.java:335)

zombie.gameStates.GameLoadingState$1.run(GameLoadingState.java:295)

java.base/java.lang.Thread.run(Unknown Source)