How do I fix this problem with GenerateProjectFiles.bat

C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\Mac\MacToolChain.cs(11,7): error CS024
6: The type or namespace name ‘Ionic’ could not be found (are you missing a using directive or an assembly reference?)
[C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\Mac\UEDeployMac.cs(10,7): error CS0246
: The type or namespace name ‘Ionic’ could not be found (are you missing a using directive or an assembly reference?) [
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\TVOS\TVOSToolChain.cs(13,7): error CS0
246: The type or namespace name ‘Ionic’ could not be found (are you missing a using directive or an assembly reference?
) [C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\TVOS\TVOSToolChain.cs(14,7): error CS0
246: The type or namespace name ‘Ionic’ could not be found (are you missing a using directive or an assembly reference?
) [C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\Android\AndroidAARHandler.cs(13,7): er
ror CS0246: The type or namespace name ‘Ionic’ could not be found (are you missing a using directive or an assembly ref
erence?) [C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\IOS\IOSToolChain.cs(14,7): error CS024
6: The type or namespace name ‘Ionic’ could not be found (are you missing a using directive or an assembly reference?)
[C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\IOS\IOSToolChain.cs(15,7): error CS024
6: The type or namespace name ‘Ionic’ could not be found (are you missing a using directive or an assembly reference?)
[C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]
C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\Platform\Windows\UEBuildWindows.cs(11,17): erro
r CS0234: The type or namespace name ‘VisualStudio’ does not exist in the namespace ‘Microsoft’ (are you missing an ■■■
embly reference?) [C:\UE4_25_4\UnrealEngine-release\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.csproj]

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