Getting error "Cannot deserialize the current JSON array..."

[sendero]

Message

Unable to retrieve queue and history items from <<<ServerName>>>: Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'NzbDrone.Core.Download.Clients.Transmission.TransmissionResponse' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.
To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.
Path '', line 1, position 1.

Exception

Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'NzbDrone.Core.Download.Clients.Transmission.TransmissionResponse' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.
To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.
Path '', line 1, position 1.
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureArrayContract(JsonReader reader, Type objectType, JsonContract contract)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
   at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
   at NzbDrone.Core.Download.Clients.Transmission.TransmissionProxy.ProcessRequest(String action, Object arguments, TransmissionSettings settings) in M:\BuildAgent\work\6c3239faf2b92630\src\NzbDrone.Core\Download\Clients\Transmission\TransmissionProxy.cs:line 270
   at NzbDrone.Core.Download.Clients.Transmission.TransmissionProxy.GetTorrentStatus(IEnumerable`1 hashStrings, TransmissionSettings settings) in M:\BuildAgent\work\6c3239faf2b92630\src\NzbDrone.Core\Download\Clients\Transmission\TransmissionProxy.cs:line 179
   at NzbDrone.Core.Download.Clients.Transmission.TransmissionProxy.GetTorrents(TransmissionSettings settings) in M:\BuildAgent\work\6c3239faf2b92630\src\NzbDrone.Core\Download\Clients\Transmission\TransmissionProxy.cs:line 43
   at NzbDrone.Core.Download.Clients.Transmission.TransmissionBase.GetItems() in M:\BuildAgent\work\6c3239faf2b92630\src\NzbDrone.Core\Download\Clients\Transmission\TransmissionBase.cs:line 40
   at NzbDrone.Core.Download.TrackedDownloads.DownloadMonitoringService.ProcessClientDownloads(IDownloadClient downloadClient) in M:\BuildAgent\work\6c3239faf2b92630\src\NzbDrone.Core\Download\TrackedDownloads\DownloadMonitoringService.cs:line 86

[markus101]

We need the following information:

Sonarr version (exact version):
Mono version (if Sonarr is not running on Windows):
OS:
((Debug logs)):
(Make sure debug logging is enabled in settings and post the full log to hastebin/pastebin/dropbox/google drive or something similar, do not post them directly here)