System.AggregateException: One or more errors occurred. (There was an error creating a DbContext :/home/dell/prog/Scaffolding/tools/dotnet-aspnet-codegenerator/Startup.cs(7,7): warning CS0105: Dyrektywa using dla elementu „Microsoft.Extensions.DependencyInjection” już wystąpiła w tej przestrzeni nazw
         at Microsoft.VisualStudio.Web.CodeGeneration.EntityFrameworkCore.EntityFrameworkModelProcessor.Process() in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG.EFCore/EntityFrameworkModelProcessor.cs:line 226
         at Microsoft.VisualStudio.Web.CodeGeneration.EntityFrameworkCore.EntityFrameworkServices.GetModelMetadata(String dbContextFullTypeName, ModelType modelTypeSymbol, String areaName, Boolean useSqlite) in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG.EFCore/EntityFrameworkServices.cs:line 138
         at Microsoft.VisualStudio.Web.CodeGenerators.Mvc.ModelMetadataUtilities.ValidateModelAndGetEFMetadata(CommonCommandLineModel commandLineModel, IEntityFrameworkService entityFrameworkService, IModelTypesLocator modelTypesLocator, String areaName) in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG.Mvc/ModelMetadataUtilities.cs:line 52
         at Microsoft.VisualStudio.Web.CodeGenerators.Mvc.Razor.EFModelBasedRazorPageScaffolder.GenerateCode(RazorPageGeneratorModel razorGeneratorModel) in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG.Mvc/RazorPage/EFModelBasedRazorPageScaffolder.cs:line 93
         at Microsoft.VisualStudio.Web.CodeGenerators.Mvc.Razor.RazorPageGenerator.GenerateCode(RazorPageGeneratorModel razorPageGeneratorModel) in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG.Mvc/RazorPage/RazorPageGenerator.cs:line 82
         --- End of inner exception stack trace ---
         at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
         at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
         at System.Threading.Tasks.Task.Wait()
         at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.<BuildCommandLine>b__8_0() in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG.Core/ActionInvoker.cs:line 102
         at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args) in /home/dell/.nuget/packages/microsoft.extensions.commandlineutils.sources/6.0.0-preview.3.21166.3/contentFiles/cs/netstandard1.0/CommandLine/CommandLineApplication.cs:line 374
         at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.Execute() in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG.Core/ActionInvoker.cs:line 54
         at Microsoft.VisualStudio.Web.CodeGeneration.CodeGenCommand.Execute() in /home/dell/prog/Scaffolding/src/Scaffolding/VS.Web.CG/CodeGenCommand.cs:line 93