Reading Actaris/Itron SL7000 with Gurux.DLMS.cpp

Hi,
I'm trying to read the load profile of an Actaris SL7000, but it doesn't seem to work as expected. I'm using Gurux.DLMS.cpp from github (my HEAD is at af9475b004d66).

The code:

CGXDLMSClient cl(true, 1,
CGXDLMSClient::GetServerAddress(1, 17, 4),
DLMS_AUTHENTICATION_LOW, "ABCDEFGH");
[...]
CGXCommunication comm(&cl, 1500, true);
[...]
comm.Connect("myhost", myPort));
[...]
CGXDLMSVariant rows;
CGXDateTime start(2016, 4, 23, 10, 54, 0, 0, 0);
CGXDateTime stop(2016, 5, 24, 11, 54, 0, 0, 0);

CGXDLMSProfileGeneric profile("1.0.99.1.0.255");
CGXDLMSClock k("0.0.1.0.0.255");
profile.SetSortObject(&k);
ret = comm.ReadRowsByRange (&profile, &start.GetValue(), &stop.GetValue(), rows);
[...]

The output:

InitializeConnection
<- 08:35:58 7E A0 0A 00 02 00 23 03 93 9B 61 7E
-> 08:35:58 7E A0 23 03 00 02 00 23 73 C0 48 81 80 14 05 02 00 80 06 02 00 80 07 04 00 00 00 01 08 04 00 00 00 01
<- 08:35:58 7E A0 47 00 02 00 23 03 10 41 3E E6 E6 00 60 36 A1 09 06 07 60 85 74 05 08 01 01 8A 02 07 80 8B 07 60 85 74 05 08 02 01 AC 0A 80 08 41 42 43 44 45 46 47 48 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 00 7E 1F FF FF 45 2E 7E
-> 08:35:59 7E A0 53 03 00 02 00 23 30 13 29 E6 E7 00 61 42 A1 09 06 07 60 85 74 05 08 01 01 A2 03 02 01 00 A3 05 A1 03 02 01 00 88 02 07 80 89 07 60 85 74 05 08 02 01 AA 0A 80 08 41 42 43 44 45 46 47 48 BE 10 04 0E 08 00 06 5F 1F 04 00 00 30 1D 21 34 00 07
<- 08:35:59 7E A0 2F 00 02 00 23 03 32 38 46 E6 E6 00 C0 01 81 00 07 01 00 63 01 00 FF 02 01 02 02 04 06 00 00 00 01 06 00 00 00 14 12 00 01 12 00 00 6F EF 7E
gurux.dlms.client.bin: src/GXHelpers.cpp:1235: static int GXHelpers::GetData(CGXByteBuffer&, CGXDataInfo&, CGXDLMSVariant&): Assertion `0' failed.

info.GetType () in GXHelpers::GetData returns 196, hence the assertion.

Is there something I'm missing?