Freshing install with Mono.Security.Interface.MonoTlsProvider Error against Google Drive

Fresh install, able to connect to google drive for OAUTH validation, but getting this error from the application in /var/log/syslog

May 20 16:55:56 plexstreamer1 duplicati-server[632548]: System.TypeLoadException: Could not load type of field 'System.Net.HttpWebRequest:tlsProvider' (49) due to: Could not resolve type with token 01000030 from typeref (expected class 'Mono.Security.Interface.MonoTlsProvider' in assembly 'Mono.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756') assembly:Mono.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756 type:Mono.Security.Interface.MonoTlsProvider member:(null)

May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.OAuthHelper.CreateRequest (System.String url, System.String method) [0x00000] in <13d5e7013bfa43fea2736c6f372a6cef>:0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.JSONWebHelper.GetJSONData[T] (System.String url, System.Action1[T] setup, System.Action1[T] setupbodyreq) [0x00000] in <13d5e7013bfa43fea2736c6f372a6cef>:0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.Backend.GoogleDrive.GoogleDrive.GetAboutInfo () [0x0000b] in <07138b3eb08a4b7d84cf8c11a8c6e95c>:0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.Backend.GoogleDrive.GoogleDrive.GetFolderId (System.String path, System.Boolean autocreate) [0x0000a] in <07138b3eb08a4b7d84cf8c11a8c6e95c>:0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.Backend.GoogleDrive.GoogleDrive.get_CurrentFolderId () [0x0000d] in <07138b3eb08a4b7d84cf8c11a8c6e95c>:0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.Backend.GoogleDrive.GoogleDrive+d__17.MoveNext () [0x00040] in <07138b3eb08a4b7d84cf8c11a8c6e95c>:0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.Interface.BackendExtensions.TestList (Duplicati.Library.Interface.IBackend backend) [0x00017] in :0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Library.Backend.GoogleDrive.GoogleDrive.Test () [0x00000] in <07138b3eb08a4b7d84cf8c11a8c6e95c>:0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Server.WebServer.RESTMethods.RemoteOperation.TestConnection (System.String url, Duplicati.Server.WebServer.RESTMethods.RequestInfo info) [0x000b7] in :0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Server.WebServer.RESTMethods.RemoteOperation.POST (System.String key, Duplicati.Server.WebServer.RESTMethods.RequestInfo info) [0x00094] in :0
May 20 16:55:56 plexstreamer1 duplicati-server[632548]: at Duplicati.Server.WebServer.RESTHandler.DoProcess (Duplicati.Server.WebServer.RESTMethods.RequestInfo info, System.String method, System.String module, System.String key) [0x00289] in :0

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What version of mono are you running?