com_read: return 258 Invalid parameter

Hello,

I try to read profile generic on SL7000 using ANSI C.
I read using "com_read" for "1.1.98.128.4.255", and attributeOrdinal value is 2. the return code is: 258 Invalid parameter

here it's the code:
cosem_init(&profile1.base, DLMS_OBJECT_TYPE_PROFILE_GENERIC, "1.1.98.128.4.255");
ret = com_read(&profile1.base, 2);

when I capture the packet from the meter to the controller, and decode using XML translator, it says:

7E A0 89 03 00 02 00 23 52 82 74 E6 E7 00 C4 01 81 00 01 01 02 06 02 03 09 06 01 01 1F 07 00 FF 12 00 04 02 02 0F FD 16 21 02 03 09 06 01 01 33 07 00 FF 12 00 04 02 02 0F FD 16 21 02 03 09 06 01 01 47 07 00 FF 12 00 00 02 02 0F FD 16 21 02 03 09 06 01 01 20 07 00 FF 12 07 E3 02 02 0F FF 16 23 02 03 09 06 01 01 34 07 00 FF 12 00 0A 02 02 0F FF 16 23 02 03 09 06 01 01 48 07 00 FF 12 00 09 02 02 0F FF 16 23 31 F5 7E

<HDLC len="136">
<TargetAddress Value="1" />
<SourceAddress Value="16401" />
<!--I frame.-->
<FrameType Value="52" />
<PDU>
<GetResponse>
<GetResponseNormal>
<!--Priority: HIGH ServiceClass: UN_CONFIRMED invokeID: 1-->
<InvokeIdAndPriority Value="129" />
<Result>
<Data>
<Array Qty="1">
<Structure Qty="6">
<Structure Qty="3">
<!--1.1.31.7.0.255-->
<OctetString Value="01011F0700FF" />
<UInt16 Value="4" />
<Structure Qty="2">
<Int8 Value="-3" />
<Enum Value="33" />
</Structure>
</Structure>
<Structure Qty="3">
<!--1.1.51.7.0.255-->
<OctetString Value="0101330700FF" />
<UInt16 Value="4" />
<Structure Qty="2">
<Int8 Value="-3" />
<Enum Value="33" />
</Structure>
</Structure>
<Structure Qty="3">
<!--1.1.71.7.0.255-->
<OctetString Value="0101470700FF" />
<UInt16 Value="0" />
<Structure Qty="2">
<Int8 Value="-3" />
<Enum Value="33" />
</Structure>
</Structure>
<Structure Qty="3">
<!--1.1.32.7.0.255-->
<OctetString Value="0101200700FF" />
<UInt16 Value="2019" />
<Structure Qty="2">
<Int8 Value="-1" />
<Enum Value="35" />
</Structure>
</Structure>
<Structure Qty="3">
<!--1.1.52.7.0.255-->
<OctetString Value="0101340700FF" />
<UInt16 Value="10" />
<Structure Qty="2">
<Int8 Value="-1" />
<Enum Value="35" />
</Structure>
</Structure>
<Structure Qty="3">
<!--1.1.72.7.0.255-->
<OctetString Value="0101480700FF" />
<UInt16 Value="9" />
<Structure Qty="2">
<Int8 Value="-1" />
<Enum Value="35" />
</Structure>
</Structure>
</Structure>
</Array>
</Data>
</Result>
</GetResponseNormal>
</GetResponse>
</PDU>
</HDLC>

my question is, why the com_read return 258 Invalid parameter?
when I try to read same OBIS Code, but different attributeOrdinal, 1 and 3, it's return 0 (OK).
or it's need another way to read the attributeOrdinal 2?

Best Regards,

Feryan