my MongoDB database: plant_growth_system

the collectiong: General_Plant

when trying to connect to : http://localhost:59707/GeneralPlant (or any other controller)
got error : 

A timeout occured after 30000ms selecting a server using CompositeServerSelector{ Selectors = MongoDB.Driver.MongoClient+AreSessionsSupportedServerSelector, 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/ds111065.mlab.com:11065" }", EndPoint: "Unspecified/ds111065.mlab.com:11065", State: "Disconnected", Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server. ---> MongoDB.Driver.MongoAuthenticationException: Unable to authenticate using sasl protocol mechanism SCRAM-SHA-1. ---> MongoDB.Driver.MongoCommandException: Command saslStart failed: Authentication failed..

  at MongoDB.Driver.Core.WireProtocol.CommandUsingQueryMessageWireProtocol`1.ProcessReply(ConnectionId connectionId, ReplyMessage`1 reply)
  at MongoDB.Driver.Core.WireProtocol.CommandUsingQueryMessageWireProtocol`1.<ExecuteAsync>d14.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.Authentication.SaslAuthenticator.<AuthenticateAsync>d7.MoveNext()
  --- End of inner exception stack trace ---
  at MongoDB.Driver.Core.Authentication.SaslAuthenticator.<AuthenticateAsync>d7.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.Authentication.DefaultAuthenticator.<AuthenticateAsync>d7.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.Authentication.AuthenticationHelper.<AuthenticateAsync>d1.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.ConnectionInitializer.<InitializeConnectionAsync>d3.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.<OpenHelperAsync>d48.MoveNext()
  --- End of inner exception stack trace ---
  at MongoDB.Driver.Core.Connections.BinaryConnection.<OpenHelperAsync>d48.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.<HeartbeatAsync>d28.MoveNext()" }] }.

please your help.

thanks,

Hanan