Packaging Failed

after i did this the engine will not open and i get this error code.

when i want to open the project i get the message “The Following modules are missing or built in a different engine Version” i click on yes and get this message : FateChapter2 could not be compiled. Try rebuilding from source manually

Running C:/Program Files/Epic Games/UE_4.21/Engine/Binaries/DotNET/UnrealBuildTool.exe -projectfiles -project=“C:/Users/irisn/Documents/Unreal Projects/FateChapter2/FateChapter2.uproject” -game -rocket -progress -log=“C:\Users\irisn\Documents\Unreal Projects\FateChapter2/Saved/Logs/UnrealVersionSelector-2021.08.13-00.30.11.log”
Discovering modules, targets and source code for project…
While compiling C:\Users\irisn\Documents\Unreal Projects\FateChapter2\Intermediate\Build\BuildRules\FateChapter2ModuleRules.dll:
c:\Users\irisn\Documents\Unreal Projects\FateChapter2\Intermediate\Source\FateChapter2.Build.cs(3,14) : error CS0101: Der Namespace ‘’ enth?lt bereits eine Definition f?r ‘FateChapter2’.
c:\Users\irisn\Documents\Unreal Projects\FateChapter2\Intermediate\Source\FateChapter2.Target.cs(3,14) : error CS0101: Der Namespace ‘’ enth?lt bereits eine Definition f?r ‘FateChapter2Target’.
ERROR: UnrealBuildTool Exception: Unable to compile source files.