DDS.Retcode_NoData exception

Hi folks,

I am struggling with one thing. The thing is that my publisher publishes some DDS topic on PC 1. My subscriber on other PC 2 in the same LAN successfully reads the published data, but the same executable of my subscriber on the same PC 1 machine does not read and gives an DDS.Retcode_NoData exception (i.e.   catch (DDS.Retcode_NoData ndex)   below). The same QOS file is on both PCs and I don’t have it in the same folder where the executables are, but rather I have it somewhere else and I refer to it through environment variable (NDDS_QOS_PROFILES = "c:\\somefolder\\ USER_QOS_PROFILES.xml").

internal SomeDataReturnType GetDiagnosticInfoForWI(string wiIDName)
{
    if (!HasValidSomeDataDDSSubscriber)   
        return null;

    try
    {
        ddsReaderSomeData.read(receivedSomeDataData, info_seq_SomeData,
                                DDS.ResourceLimitsQosPolicy.LENGTH_UNLIMITED,
                                DDS.SampleStateKind.ANY_SAMPLE_STATE,
                                DDS.ViewStateKind.ANY_VIEW_STATE,
                                DDS.InstanceStateKind.ANY_INSTANCE_STATE);

        for (int i = 0; i < receivedSomeDataData.length; i++)
        {
            DDS.SampleInfo info = info_seq_SomeData.get_at(i);

            SomeData di = receivedSomeDataData.get_at(i);

            if (!info.valid_data)
                continue;

            //............ something goes here

            return new SomeDataReturnType(di.di_date_time, diStrings);
        }

        return null;
    }
    catch (DDS.Retcode_NoData ndex)
    {
        //EXCEPTION HAPPENS HERE

        return null;
    }
    catch (DDS.Exception ex)
    {
        return null;
    }
    finally
    {
        ddsReaderSomeData.return_loan(receivedSomeDataData, info_seq_SomeData);
    }
}

Any ideas please??? I will greatly appreciate your help.

Thank you  in advance.

Tiger Galo