AutomationTool exiting with ExitCode=25, SkeletalMesh.cpp: Invalid number of texture coordinates

I have a simple rolling project that, when trying to package it fails and shows this output log

Lines 538 and 539 seem to be the culprits here:UATHelper:

LogWindows:Error: Fatal error: [File:D:\Build\++UE4+Release-4.15+Compile\Sync\Engine\Source\Runtime\Engine\Private\SkeletalMesh.cpp] [Line: 424] 

LogWindows:Error: Invalid number of texture coordinates

but i’m not sure what that means. There are 0 skeletal meshes in my project and I have tried exporting it on 2 different machines running UE4 4.15.2

I’ll gladly provide any additional info and if anyone wants to try to package it on their own, the entire project is posted here:

Updating to UE4 4.16 Preview fixed the issue. I’ll leave this open if anyone knows and wants to comment on why it happened