How to resolve "Source not found" Error in Package Mapping Context in .NET

This is the error I'm facing while intalling any kind of package from the Dotner CLI. Is there any way to resolve this. All solution are appreaciated!!

dotnet tool install --global dotnet-efUnhandled exception: Microsoft.DotNet.Cli.NuGetPackageDownloader.NuGetPackageInstallerException: Package Source Mapping is enabled, but no source found under the specified package ID: dotnet-ef. See the documentation for Package Source Mapping at https://aka.ms/nuget-package-source-mapping for more details.   at Microsoft.DotNet.Cli.NuGetPackageDownloader.NuGetPackageDownloader.LoadNuGetSources(PackageId packageId, PackageSourceLocation packageSourceLocation, PackageSourceMapping packageSourceMapping)   at Microsoft.DotNet.Cli.NuGetPackageDownloader.NuGetPackageDownloader.GetBestPackageVersionAsync(PackageId packageId, VersionRange versionRange, PackageSourceLocation packageSourceLocation)   at Microsoft.DotNet.Cli.ToolPackage.ToolPackageDownloader.<>c__DisplayClass8_0.<InstallPackage>b__0()   at Microsoft.DotNet.Cli.TransactionalAction.Run[T](Func`1 action, Action commit, Action rollback)   at Microsoft.DotNet.Tools.Tool.Install.ToolInstallGlobalOrToolPathCommand.Execute()   at System.CommandLine.Invocation.InvocationPipeline.Invoke(ParseResult parseResult)   at Microsoft.DotNet.Cli.Program.ProcessArgs(String[] args, TimeSpan startupTime, ITelemetry telemetryClient)

I tried :

dotnet nuget locals all --clear

dotnet nuget add source https://api.nuget.org/v3/index.json --name nuget.org

But none of this seems to work.