I cannot package my game...What to do?

Guys I am having this error:‘Packaging Failed in windows -64 bit’
the "code’ of the error is this:’

BuildAndSubmitErrors: New page: Build and Submit
BuildAndSubmitErrors: Error: Cannot connect to source control; automated build aborted.
LogSlate: Window 'Message Log' being destroyed
LogSlate: Window 'Message Log' being destroyed
LogSlate: Window 'Build and Submit' being destroyed
LogSlate: Window 'Build and Submit' being destroyed
LogWindowsTextInputMethodSystem: Display: IME system now deactivated.
LogWindowsTextInputMethodSystem: Display: IME system now deactivated.
LogUObjectHash: Compacting FUObjectHashTables data took   3.45ms
Cmd: OBJ SAVEPACKAGE PACKAGE="/Game/EvilCubeMad" FILE="../../../../../../Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/Content/EvilCubeMad.umap" SILENT=true AUTOSAVING=false KEEPDIRTY=false
LogUObjectHash: Compacting FUObjectHashTables data took   1.59ms
LogSavePackage: Moving '../../../../../../Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/Saved/EvilCubeMad1FF6286A4F921C94E80084A75F61D68B.tmp' to '../../../../../../Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/Content/EvilCubeMad.umap'
LogFileHelpers: Saving map 'EvilCubeMad' took 0.837
Cmd: OBJ SAVEPACKAGE PACKAGE="/Game/EvilCubeMad_BuiltData" FILE="../../../../../../Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/Content/EvilCubeMad_BuiltData.uasset" SILENT=true
LogSavePackage: Moving '../../../../../../Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/Saved/EvilCubeMad_BuiltData535C2B5E433B02D83CB13EBAEF5FAA26.tmp' to '../../../../../../Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/Content/EvilCubeMad_BuiltData.uasset'
LogMainFrame: Project does not require temp target
LogLauncherProfile: Found promoted target with matching version at ../../../Engine/Binaries/Win64/UE4Game-Win64-Shipping.target
AssetCheck: New page: Asset Save: multiple assets
LogContentValidation: Display: Validating World /Game/EvilCubeMad.EvilCubeMad
LogContentValidation: Display: Validating MapBuildDataRegistry /Game/EvilCubeMad_BuiltData.EvilCubeMad_BuiltData
UATHelper: Packaging (Windows (64-bit)): Running AutomationTool...
UATHelper: Packaging (Windows (64-bit)): Parsing command line: -ScriptsForProject=C:/Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/My_First_Game.uproject BuildCookRun -nocompileeditor -installed -nop4 -project=C:/Users/ΓΙΑΝΝΗΣ/Desktop/Unity/My_First_Game/My_First_Game.uproject -cook -stage -archive -archivedirectory=C:/Users/ΓΙΑΝΝΗΣ/Desktop -package -ue4exe="C:\
Program Files\Epic Games\UE_4.25\Engine\Binaries\Win64\UE4Editor-Cmd.exe" -clean -pak -prereqs -nodebuginfo -targetplatform=Win64 -clientconfig=Shipping -utf8output
UATHelper: Packaging (Windows (64-bit)): C:\Users\ΓΙΑΝΝΗΣ\AppData\Roaming\Unreal Engine\UnrealBuildTool\BuildConfiguration.xml(1): error: Το '.', δεκαεξαδική τιμή 0x00, δεν είναι έγκυρος χαρακτήρας. Γραμμή 1, θέση 1.
PackagingResults: Error: Το '.', δεκαεξαδική τιμή 0x00, δεν είναι έγκυρος χαρακτήρας. Γραμμή 1, θέση 1.
UATHelper: Packaging (Windows (64-bit)): ERROR: Failed to properly read XML file : C:\Users\ΓΙΑΝΝΗΣ\AppData\Roaming\Unreal Engine\UnrealBuildTool\BuildConfiguration.xml
UATHelper: Packaging (Windows (64-bit)):        (see C:\Users\ΓΙΑΝΝΗΣ\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_4.25\Log.txt for full exception trace)
PackagingResults: Error: Failed to properly read XML file : C:\Users\ΓΙΑΝΝΗΣ\AppData\Roaming\Unreal Engine\UnrealBuildTool\BuildConfiguration.xml
UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults: Error: Unknown Error
LogSlate: Window 'Output Log' being destroyed
LogSlate: Window 'Output Log' being destroyed
LogWindowsTextInputMethodSystem: Display: IME system now deactivated.
LogWindowsTextInputMethodSystem: Display: IME system now deactivated.'