Local Plugin No Configure button & Doesn't Install

I already develop a payment plugin that works for African Markets but i cant install or configure it from the admin panel
Below is the log

The "Send emails" scheduled task failed with the "Connection refused (localhost:21334)" error (Task type: "Nop.Services.Messages.QueuedMessagesSendTask, Nop.Services". Store name: "Your store name". Task run address: "http://localhost:21334/scheduletask/runtask").

The "Send emails" scheduled task failed with the "Connection refused (localhost:21334)" error (Task type: "Nop.Services.Messages.QueuedMessagesSendTask, Nop.Services". Store name: "Your store name". Task run address: "http://localhost:21334/scheduletask/runtask").
Full message
System.Net.Http.HttpRequestException: Connection refused (localhost:21334)
---> System.Net.Sockets.SocketException (61): Connection refused
   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
   at System.Net.Sockets.Socket.<ConnectAsync>g__WaitForConnectWithCancellation|281_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.AddHttp11ConnectionAsync(QueueItem queueItem)
   at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.HttpConnectionWaiter`1.WaitForConnectionAsync(Boolean async, CancellationToken requestCancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.<SendAsync>g__Core|5_0(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.<SendAsync>g__Core|5_0(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
   at Nop.Services.ScheduleTasks.TaskScheduler.TaskThread.RunAsync() in /Users/ruthmadubuike/RiderProjects/nopCommerce-develop/src/Libraries/Nop.Services/ScheduleTasks/TaskScheduler.cs:line 189

This error message is not related to the Plugin
What Email SMTP Server are you using - Check the Email Login details
Also Check your store settings

RE the pluign - what version of nopCommerce are you using ?
Do you have the correct Version in plugin.json to to match nopCommerce version
i.e.   "SupportedVersions": [ "4.60" ],
If so Restart the webserver and see if the Plugin is displayed then