cant installeren [.be ​​core] pakketten via Visual Studio code (dotnet cli)


Ik gebruik van de nieuwste asp kern 3.1 framework. Probeer aan opstelling mijn database. maar er is een probleem. Ik kan niet schijnen om de volgende pakketten te installeren

dotnet tool install --global dotnet-ef
dotnet tool install --global dotnet-aspnet-codegenerator
dotnet add package Microsoft.EntityFrameworkCore.SQLite
dotnet add package Microsoft.VisualStudio.Web.CodeGeneration.Design
dotnet add package Microsoft.EntityFrameworkCore.Design
dotnet add package Microsoft.EntityFrameworkCore.SqlServer

i get the following errors. will appreciate it if any one can help with 
a solution.

error NU1100: Unable to resolve 'dotnet-aspnet-codegenerator ' for '.NETCoreApp,Version=v3.1'.
error NU1100: Unable to resolve 'dotnet-aspnet-codegenerator ' for '.NETCoreApp,Version=v3.1/any'.
The tool package could not be restored.
Tool 'dotnet-aspnet-codegenerator' failed to install. This failure may have been caused by:

* You are attempting to install a preview release and did not use the --version option to specify the version.
* A package by this name was found, but it was not a .NET Core tool.
* The required NuGet feed cannot be accessed, perhaps because of an Internet connection problem.
* You mistyped the name of the tool.

Dit gebeurt wanneer ik probeer om één van de pakketten te installeren.

De vraag is gesteld op 13/01/2020 om 22:04
bron van user
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