As of
Cucumber-1.12.2-1.1.3
Mantle-1.12-1.3.3.49
MysticalAgriculture-1.12.2-1.7.5
TConstruct-1.12.2-2.12.0.135
MysticalAgradditions-1.12.2-1.3.1
game will crash at boot:

java.lang.NoClassDefFoundError: com/blakebr0/mysticalagriculture/util/Utils
	at com.blakebr0.mysticalagradditions.tinkers.TraitProsperous.getLocalizedName(TraitProsperous.java:24)

https://gist.github.com/LemADEC/ef7b015388f151f205ea7c3d8354380e

Looks like MysticalAgriculture updated its structure, breaking compatibility with MysticalAgradditions .

I have the same problem. It seems like the Utils class moved from MysticalAgriculture to Cucumber.

Should be fixed in version 1.3.2 of agradditions