fabric:1.14.4
cotton etc :
cotton: Cotton 1.0.0-rc.2
cotton-cauldron: Cotton Cauldron 1.0.0-rc.1
cotton-client-commands: Cotton Client Commands 0.4.2+1.14.3-SNAPSHOT
cotton-commons: Cotton Commons 1.0.0-rc.1
cotton-config: Cotton Config 1.0.0-rc.1
cotton-datapack: Cotton Datapack 1.0.0-rc.1
cotton-energy: Cotton Energy 1.5.0+1.14.3
cotton-logging: Cotton Logging 1.0.0-rc.1
cotton-player-events: Cotton Player Events 1.0.0-rc.2
cotton-resources: Cotton Resources 1.3.2+1.14.3
libcd: LibCapableData 1.3.0+1.14.3
fabric: Fabric API 0.3.0+build.200

crash report:
crash-2019-07-21_16.09.27-client.txt
log:
latest.log

LibGui is needed; it contains all this code now. The packages are the same, so just drop that in.

okay thank you :)
also why isnt it listed as dependency then

It isn't one for Cotton. Whichever mod is causing this (I'm betting VivaTech, as it's the only publicly-released mod I'm aware of that uses libgui) hasn't been updated for the new Cotton rework, so it doesn't realize the code's been moved elsewhere.