Defining Captured Objects List Manually

Hi,
I'm trying to read a Profile Generic obis using the .net client example:
============
//reading the first record
GXDLMSProfileGeneric profileGeneric = new GXDLMSProfileGeneric("8.0.99.98.12.255");
object val = reader.ReadRowsByEntry(profileGeneric, 2, 1);
============
I get the following error: Captured Objects not read.

when trying to read the captured objects before reading the first record:
============
GXDLMSProfileGeneric profileGeneric = new GXDLMSProfileGeneric("8.0.99.98.12.255");
object res = reader.Read(profileGeneric, 3);
object val = reader.ReadRowsByEntry(profileGeneric, 2, 1);
============
I get the following error: Access error: other reason.
It seems I don't have access to read the objects list.
Using the GXDLMSDirector I can read the profile generic obis fine, but when I click on the capture button I get the same error: Access error: other reason.

I tried defining the list manually before reading like this:
============
GXDLMSProfileGeneric profileGeneric = new GXDLMSProfileGeneric("8.0.99.98.12.255");
//define list of captured objects
var capturedObjectsList = new List<GXKeyValuePair<GXDLMSObject, GXDLMSCaptureObject>>();
//define capture objects one by one...
var c = new GXKeyValuePair<GXDLMSObject, GXDLMSCaptureObject>();
GXDLMSData gxobject = new GXDLMSData();
gxobject.LogicalName = "8.0.17.0.0.255";
GXDLMSCaptureObject captureObject = new GXDLMSCaptureObject();
captureObject.AttributeIndex = 2;
captureObject.DataIndex = 0;
c.Key = gxobject;
c.Value = captureObject;

//define the other objects ... then add them to the list
capturedObjectsList.Add(c);

//add the rest of the objects to the list and equate the list to the captured objects list inside the //profileGeneric
profileGeneric.CaptureObjects = capturedObjectsList;

//start reading
reader.ReadRowsByEntry(profileGeneric, 2, 1);
============
However after adding all the objects, I get a the following exception when reading: service exception operation not allowed.

Is this the right way to define the captured objects list?
Is there another way to read a profile generic obis without capturing the objects first?

sorry for the long question, thank you.