PackagingResults:Error: Error Unknown Error // Please help (log included)

Hi, I am using UE 4.14.3 with BPs and tried to compile a simple project that includes the “Online Subsystem Steam” plugin and some basic UI elements to play the third person template together. When trying to package for WIndows 64bit I get following errors/warnings and the packaging fails:

LogOnline:Warning: STEAM: Steam API disabled!

LogUObjectGlobals:Warning: Failed to find object ‘Class None.’

PackagingResults:Error: Error Unknown Error

LogOnline:Warning: STEAM: Steam API disabled!

LogStats:Warning: MetaData mismatch. Did you assign a stat to two groups? New //STATGROUP_Threads//OnlineAsyncTaskThreadNull DefaultInstance///Thread_16e0_0///####STATCAT_Advanced#### old //STATGROUP_Threads//OnlineAsyncTaskThreadNull DefaultInstance///Thread_880_0///####STATCAT_Advanced####

LogOnline:Warning: NULL: Ignoring game search request while one is pending

LogOnline:Warning: NULL: Ignoring game search request while one is pending

LogOnline:Warning: NULL: Ignoring game search request while one is pending

LogOnline:Warning: NULL: Ignoring game search request while one is pending

LogOnline:Warning: NULL: Ignoring game search request while one is pending

PackagingResults:Error: Error Unknown Error

LogDirectoryWatcher:Warning: Failed to begin reading directory changes for …/…/…/…/…/…/Users/Niklas/Documents/Unreal Projects/SteamGame/Plugins/. Error: The system couldnt find the selected file. (0x00000002)

PackagingResults:Error: Error Unknown Error

Full log: LogPlatformFile: Not using cached read wrapperLogInit:Display: RandInit(549027 - Pastebin.com