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Inbound JSON Serialization Error

I'm trying to consume an inbound JSON file I've also tried with code that duplicates it here. The client crashes at the JsonTextReader statement and throws the following error:

Type: System.Runtime.Serialization.SerializationException
Message: <ii>Type 'System.IO.StringReader' with data contract name 'StringReader:schemas.datacontract.org/.../System.IO' is not expected. Consider using a DataContractResolver if you are using DataContractSerializer or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to the serializer.</ii>

ReadString := '{';
ReadString := ReadString.ToString + '"odata.metadata": "nav2018/.../OData$metadata#ScionCostComponents",';
ReadString := ReadString.ToString + '"value": [';
ReadString := ReadString.ToString + '{';
ReadString := ReadString.ToString + '"Code": "TEST",';
ReadString := ReadString.ToString + '"Descripiton": "Test1",';
ReadString := ReadString.ToString + '"Cost_Account_No": "",';
ReadString := ReadString.ToString + '"Cost_Account_Balance": "0",';
ReadString := ReadString.ToString + '"Applied_Account_No": "14200",';
ReadString := ReadString.ToString + '"Applied_Account_Balance": "0",';
ReadString := ReadString.ToString + '"Date_Filter": "0001-01-01T00:00:00"';
ReadString := ReadString.ToString + '}';
ReadString := ReadString.ToString + ']';
ReadString := ReadString.ToString + '}';