The latest version (1.5) is complaining about duplicate files despite there only being one file for aqua acrobatics.
Here is the log in case it helps: https://gist.github.com/mxnmnm/2aa4a5f3094c0af5e56c083b8f5d651c

Hmm.. can you try this build?

mod.zip

Yay that fixed it!

Thanks, 1.5.1 should be up shortly on CurseForge with the fix.