Here is a problem I found in your logs:
-TargetPlatform=WindowsNoEditor -fileopenlog -unversioned -NativizeAssets -abslog="C:\Program Files (x86)\Epic Games\4.14\Engine\Pro
grams\AutomationTool\Saved\Cook-2017.02.25-09.30.22.txt" -stdout -FORCELOGFLUSH -CrashForUAT -unattended -UTF8Output
As a troubleshooting step, try packaging without nativisation. There have been a couple of reports of problems using nativisation in UE4.15, so it may be the issue here.
Let me know if this does not resolve the issue.