Hello Guys… I’m new to game development. Trying to use launch the game on this windows device option but every single time it says “PackagingResults:Error: Error Launch failed! Unknown Error”
I attached last part of output log.
Please help me guys!
][1]
<< whole output log is here.
Seems like you are having problems with your filename lengths, as your errors all look somehow like this one:
CookResults:Error: Error Couldn’t save package, filename is too long: C:/Users/Ragib Hasan Supanta/Desktop/Uni Project Final/14201009 4.16/Saved/EditorCooked/WindowsNoEditor/Project3/Content/InfinityBladeGrassLands/Environments/Plains/Env_Plains_Ruins/StaticMesh/SM_Plains_Ruin_BuildingLOD02.uasset
You’ll find a better explanation about it here:
Thanks for the answer. i will look into this 
dont forget to mark it as an answer if it solves your problem
