Error after get_freq

Hello,

I use you component for Kylix in Lazarus. I must made some changes but, it
compiles without problems.
But I have a problem with get_freq or something other function.
Here is the source:

var
  ri : PRig;
  freq : freq_t;
  retval : Integer;
begin
   rig_set_debug(RIG_DEBUG_VERBOSE);
   ri := rig_init(120); //ft-817
   ri^.state.rigport.pathname  := PChar('/dev/ttyUSB0');
   ri^.state.rigport.parm.serial.rate      := 9600;
   ri^.state.rigport.parm.serial.parity    := RIG_PARITY_NONE;
   ri^.state.rigport.parm.serial.data_bits := 8;
   ri^.state.rigport.parm.serial.stop_bits := 1;
   ri^.state.rigport.parm.serial.handshake := RIG_HANDSHAKE_NONE;
   retval := rig_open(ri);
   if retval = RIG_OK then
     Writeln('Riginit: ','OK')
   else
     Writeln('Riginit: ',retval);
   retval := rig_set_vfo(ri,RIG_VFO_A);
   Writeln('Retval set_vfo: ',retval);
   retval := rig_get_freq(ri,RIG_VFO_CURR,freq);
   if retval = RIG_OK then
   begin
     WriteLn('Freq ',freq);
     Writeln('Freq OK')
   end
   else
     Writeln('Retval freq: ',retval);
   rig_close(ri);
end;

rig_ini and rig_open is OK, but if I try rig_set_vfo return value is -11.
Why? Could you help me? I developing new station log for Linux in
Lazarus/Freepascal.

Console output:

rig_register (1601)
rig_register (1607)
rig_register (1608)
rig_register (1602)
rig_register (1603)
rig_register (1604)
rig_register (1605)
rig: loading backend alinco
alinco: _init called
rig_register (1701)
rig: loading backend kachina
kachina: _init called
rig_register (1801)
rig: loading backend rpcrig
rpcrig: _init called
rig_register (1901)
rig: loading backend gnuradio
rig:  lt_dlopen("hamlib-gnuradio") failed (hamlib-gnuradio.so: cannot open shared object file: No such file or directory), trying static symbols...
rig: dlsym(initrigs2_gnuradio) failed (./hamlib: undefined symbol: initrigs2_gnuradio)
rig: loading backend microtune
microtune: _init called
rig_register (2101)
rig_register (2102)
rig: loading backend tapr
tapr: _init called
rig_register (2201)
rig: loading backend flexradio
initrigs2_flexradio called
rig_register (2301)
rig: loading backend rft
rft: _init called
rig_register (2401)
rig: loading backend kit
kit: _init called
rig_register (2501)
rig_register (2502)
rig: loading backend tuner
tuner: _init called
rig_register (2601)
rig:rig_open called
ft817: ft817_open called
Riginit: OK

Retval set_vfo: -11
Retval freq: -11
rig:rig_close called
ft817: ft817_close called

Thanks for help!

Petr