The framework 'Microsoft.AspNetCore.App', version '3.1.3' was not found

I have posted same question on github dotnet issues page, the user vitek karas provided me the lead that x64 runtime C:\ProgramFiles\dotnet\shared\Microsoft.AspNetCore.App\3.1.3 folder was missing.

Then I tried reinstalling SDK 3.1.201 still folder was missing.

I also tried install aspnetcore-runtime-3.1.3 X64 still folder was missing.

finally I have downloaded and copied Microsoft.AspNetCore.App\3.1.3 folder manually from the zip file to C:\ProgramFiles\dotnet\shared\Microsoft.AspNetCore.App\3.1.3 then my core application started working .

I solved the problem by installing the Hosting bundle from here.