Summary
Tried both clean and my version with only placed items, only mine fails to cook.
tried deleting everything, still getting the error.
Please select what you are reporting on:
Unreal Editor for Fortnite
What Type of Bug are you experiencing?
Other
Steps to Reproduce
Expected Result
Observed Result
An error occurred while communicating with the game servers (failed to cook module fc5a7943-4ef3-7480-d7f3-b2b12fdc7622 (artifact b9dcdf8e-612f-4738-a3d7-f5215fb2003f:linux-server) (cookJobId cf736f8d-cff6-4e27-adfa-7a277efd77aa) with error code errors.com.epicgames.cookplugin.assetvalidationerror).
Platform(s)
win10, else newest build
Additional Notes
wanted to have an underwater track 
messed around a little with terrain and track nodes. reverted most changes.
most assets used, are from RR assets, couldn’t find other posts about this.