THis is the solution u can use :
Just Download and run the Exe of the .Net framework according to your wndow specifications
Click on this link and download the Exe file and install in your pc >> Restrat or rebuild the project and the try it
https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-6.0.28-windows-x64-installer

THis is the solution u can use :
Just Download and run the Exe of the .Net framework according to your wndow specifications
Click on this link and download the Exe file and install in your pc >> Restrat or rebuild the project and the try it
https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-6.0.28-windows-x64-installer