why this problem always happened?

Development Programming & Scripting C++
,
#1

An error occurred while trying to generate project files.

Running C:/Program Files/Epic Games/UE_5.1/Engine/Build/BatchFiles/Build.bat -projectfiles -project=“C:/Users/Ari/Documents/Unreal Projects/MyProject3/MyProject3.uproject” -game -rocket -progress
Running UnrealBuildTool: dotnet “…..\Engine\Binaries\DotNET\UnrealBuildTool\UnrealBuildTool.dll” -projectfiles -project=“C:/Users/Ari/Documents/Unreal Projects/MyProject3/MyProject3.uproject” -game -rocket -progress
‘dotnet’ is not recognized as an internal or external command,
operable program or batch file.

#2

Update visual studio and make sure you have installed all the necessary packages.

#3

Looks like you’re missing some .NET stuff on yoru PC. Did you follow this?