Getting "It's recommended to reference NuGet test adapters in each test project in the solution." #4

After downloading the script and restore reference, I clicked Run All. Getting " It's recommended to reference NuGet test adapters in each test project in the solution." When I try to download nunit 3 test adaptor, I'm getting runtime issue

[23-12-2019 20:19:46 Informational] NUnit3TestExecutor converted 3 of 3 NUnit test cases
[23-12-2019 20:20:16 Warning] TearDown failed for test fixture SpecflowParallelTest.Features.DemoFeature
[23-12-2019 20:20:16 Warning] System.TimeoutException : A timeout occured after 30000ms selecting a server using CompositeServerSelector{ Selectors = ReadPreferenceServerSelector{ ReadPreference = { Mode : Primary } }, LatencyLimitingServerSelector{ AllowedLatencyRange = 00:00:00.0150000 } }. Client view of cluster state is { ClusterId : "1", ConnectionMode : "Automatic", Type : "Unknown", State : "Disconnected", Servers : [{ ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/localhost:27017" }", EndPoint: "Unspecified/localhost:27017", State: "Disconnected", Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server. ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:27017
at System.Net.Sockets.Socket.InternalEndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory1.FromAsyncCoreLogic(IAsyncResult iar, Func2 endFunction, Action1 endAction, Task1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.TcpStreamFactory.d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.TcpStreamFactory.d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.BinaryConnection.d__48.MoveNext()
--- End of inner exception stack trace ---
at MongoDB.Driver.Core.Connections.BinaryConnection.d__48.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at MongoDB.Driver.Core.Servers.ServerMonitor.d__27.MoveNext()" }] }.
TearDown : System.NullReferenceException : Object reference not set to an instance of an object.
[23-12-2019 20:20:16 Warning] at MongoDB.Driver.Core.Clusters.Cluster.ThrowTimeoutException(IServerSelector selector, ClusterDescription description)
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChangedHelper.HandleCompletedTask(Task completedTask)
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChanged(IServerSelector selector, ClusterDescription description, Task descriptionChangedTask, TimeSpan timeout, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Clusters.Cluster.SelectServer(IServerSelector selector, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Bindings.ReadPreferenceBinding.GetReadChannelSource(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Operations.FindOperation1.Execute(IReadBinding binding, CancellationToken cancellationToken) at MongoDB.Driver.OperationExecutor.ExecuteReadOperation[TResult](IReadBinding binding, IReadOperation1 operation, CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl1.ExecuteReadOperation[TResult](IReadOperation1 operation, ReadPreference readPreference, CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl1.ExecuteReadOperation[TResult](IReadOperation1 operation, CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl1.FindSync[TProjection](FilterDefinition1 filter, FindOptions2 options, CancellationToken cancellationToken) at MongoDB.Driver.FindFluent2.ToCursor(CancellationToken cancellationToken)
at MongoDB.Driver.IAsyncCursorSourceExtensions.FirstOrDefault[TDocument](IAsyncCursorSource1 source, CancellationToken cancellationToken) at MongoDB.Driver.IFindFluentExtensions.FirstOrDefault[TDocument,TProjection](IFindFluent2 find, CancellationToken cancellationToken)
at AventStack.ExtentReports.Reporter.KlovReporter.SetupProject(Boolean setupReport)
at AventStack.ExtentReports.Reporter.KlovReporter.Start()
at AventStack.ExtentReports.Model.Report.Attach(IExtentReporter reporter)
at AventStack.ExtentReports.ExtentReports.b__6_0(IExtentReporter x)
at System.Collections.Generic.List1.ForEach(Action1 action)
at AventStack.ExtentReports.ExtentReports.AttachReporter(IExtentReporter[] reporter)
at SpecflowParallelTest.Hooks.InitializeReport() in C:\Users\aju\Downloads\SeleniumWithSpecflow-master\SpecflowParallelTest\Hooks.cs:line 53
at lambda_method(Closure , IContextManager )
at TechTalk.SpecFlow.Bindings.BindingInvoker.InvokeBinding(IBinding binding, IContextManager contextManager, Object[] arguments, ITestTracer testTracer, TimeSpan& duration)
at TechTalk.SpecFlow.Infrastructure.TestExecutionEngine.InvokeHook(IBindingInvoker invoker, IHookBinding hookBinding, HookType hookType)
at TechTalk.SpecFlow.Infrastructure.TestExecutionEngine.FireEvents(HookType hookType)
at TechTalk.SpecFlow.Infrastructure.TestExecutionEngine.OnTestRunStart()
at TechTalk.SpecFlow.TestRunner.OnTestRunStart()
at TechTalk.SpecFlow.TestRunnerManager.InitializeBindingRegistry(ITestRunner testRunner)
at TechTalk.SpecFlow.TestRunnerManager.CreateTestRunner(Int32 threadId)
at TechTalk.SpecFlow.TestRunnerManager.GetTestRunner(Int32 threadId)
at TechTalk.SpecFlow.TestRunnerManager.GetTestRunner(Assembly testAssembly, Nullable`1 managedThreadId)
at SpecflowParallelTest.Features.DemoFeature.FeatureSetup()
--TearDown
at SpecflowParallelTest.Features.DemoFeature.FeatureTearDown()