Nsure condition failed: ShouldSerializeWidgetTree

I’am making a android game and Im trying to package it for a showcase, for some reason I’am getting this error. I thought It might be related to my widgets but I cannot find where, removing my widgets didnt help I’ve read of the logs multiple times and I cant pinpoint the problem.
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Got the same error

Ok, I found the solution to my error, can you check if

LogCook: Display: Cooking /Game/Widgets/Lives → I:/Y2017B-Y2-Rooster/Project/gm3/marmalade3/Saved/Cooked/Android_Multi/marmalade3/Content/Widgets/Lives.uasset

This file should exist? My error was that in the Unreal Editor this file was deleted (by me) but for some reason it still existed in the Content folder. After deleting the file through file-explorer everything compiled.