Create and update database failed

[DramanSalif]

In Command prompt. When I run:
C:\Users\Dramane\Desktop\AlpineSkiHouse-master\src\AlpineSkiHouse.Web>dotnet ef database update --context AlpineSkiHouse.Data.ApplicationUserContext
I got this output:
System.ArgumentNullException: Value cannot be null.
Parameter name: contentRootPath
at Microsoft.EntityFrameworkCore.Utilities.Check.NotEmpty(String value, String parameterName)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations..ctor(IOperationReporter reporter, Assembly assembly, Assembly startupAssembly, String environment, String projectDir, String contentRootPath, String rootNamespace)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.<>c__DisplayClass4_0.<.ctor>b__4()
at Microsoft.EntityFrameworkCore.Internal.LazyRef`1.get_Value()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_1.<.ctor>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Value cannot be null.
Parameter name: contentRootPath

How can I solved this issue ?
My operation system is windows 10 64bit,and visual studio 2019