Symptom:
Getting the following error when attempting to use JSON2RecordList:

Method not found: 'System.Object Newtonsoft.Json.Linq.JToken.ToObject(System.Type)'.

Cause: 
Mismatch between the DLL which is deployed and the DLL required for ardoJSON. This can be caused when another JSON processing component (JSON.NET, WebServiceEngine) is included in the same eSpace or one of its dependencies.

Resolution:

Remove the dependency to the other JSON processing extension

OR

Make sure that the Newtonsoft.Json.dll in your eSpaces running folder is the same which is distributed by ardoJSON (it should be compatible with the other extensions since it is the most recent version at the time of writing).