read works but read_by_range doesn't work for ProfileGeneric object

Dear,

I successfully created a ProfileGeneric object (in http://www.gurux.fi/node/19730) and I can also read out the contents from the buffer and capture objects using the function below:

def read(self, ln, gp):
profile_generic = GXDLMSProfileGeneric(ln)
gp.reader.read(profile_generic, 3)
gp.reader.read(profile_generic, 2)
return profile_generic

pg = reader.read(ln, gp)

I can easily read the buffer contents with this read using pg.buffer.

However, read_by_range doesn't seem to work.
read_by_range DOES work with another profile that was already set in the meter, it just doesn;t work on this specific profile

The code:

begin = datetime.datetime.now() - datetime.timedelta(days=2)
end = datetime.datetime.now() - datetime.timedelta(days=1)

def read_by_range(self, ln, begin, end, gp):
profile_generic = GXDLMSProfileGeneric(ln)
gp.reader.read(profile_generic, 3)
gp.reader.readRowsByRange(profile_generic, begin, end)
return profile_generic

pg = reader.read_by_range(ln, begin, end, gp)

There IS data for those timestamps, and this code DOES work for another profile already set in the meter.

When I throw an Exception it reads the following:
Access Error : Device reports scope of access violated.

DLMS TRACE:
TX: 15:40:08 00 01 00 01 00 01 00 0D C0 01 C1 00 07 00 00 63 01 01 FF 03 00
RX: 15:40:10 00 01 00 01 00 01 00 2A C4 01 C1 00 01 02 02 04 12 00 04 09 06 00 01 18 02 01 FF 0F 02 12 00 00 02 04 12 00 08 09 06 00 00 01 00 00 FF 0F 02 12 00 00
TX: 15:40:10 00 01 00 01 00 01 00 40 C0 01 C1 00 07 00 00 63 01 01 FF 02 01 01 02 04 02 04 12 00 04 09 06 00 01 18 02 01 FF 0F 02 12 00 00 09 0C 07 E6 03 0E 01 0F 28 05 00 00 00 00 09 0C 07 E6 03 0F 02 0F 28 05 00 00 00 00 01 00
RX: 15:40:10 00 01 00 01 00 01 00 05 C4 01 C1 01 0D

Could you help me in finding out what I might be missing?

NOTE:

In GuruxDLMSDirector I am able to read out this profile between specific dates