https://pastebin.com/QxPxzDd3 - Client
https://pastebin.com/KKem8H5w - Server

Im pretty sure its the same error message

The reason is because something registered a modifier/trait with the same name as one that I have coded in (although it's currently unused) - "sticky". This would have to be from another mod besides Tinkers' Construct since my internal dev build doesn't crash.

I'm going to make a new build with the appropriate modifiers commented out so it doesn't crash like that anymore, but do you know what is adding this "sticky" modifier/trait?

The Yoyo's Mod adds the Sticky Trait

Here's the link to the Source

Also here's a link to the mod

Thanks!