Errors in currently selected datapack prevented the world from loading. (Created a new world, not joining an old one)

[BlueMoonTM]

First time seeing this error (After having played Minecraft for many, many years) and I have no clue what seems to be breaking. I've tried using the methods people have suggested to others but I always seems to have more errors. 

So far the game output has been helpful in at least seeing that I have errors, and I have gone and removed multiple mods that seemed to have causes them, but yeah.

I've got the log from once I start World generation here, but if you need more just tell me.

https://jpst.it/3ad8S

Obviously, thank you kindly for any help you may provide.

[warjort]

Quote

Caused by: java.lang.UnsupportedOperationException at MC-BOOTSTRAP/[email protected]/com.google.common.collect.ImmutableMap.put(ImmutableMap.java:714)

at TRANSFORMER/cucumber@5.1.3/com.blakebr0.cucumber.helper.RecipeHelper.addRecipe(RecipeHelper.java:52) at TRANSFORMER/[email protected]

Issue with the cucumber mod. Check you have the latest version then contact the mod author.