Randomized packet is not generated with Atomic Generator in VMM

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//filename: channel_connection.sv
 
 
`ifndef TEST_ATOMIC_GEN_SV_
`define TEST_ATOMIC_GEN_SV_
 
`include "vmm.sv"
 
class packet extends vmm_data;
 
    rand bit [31:0] vari;
    rand bit [31:0] vari2;
   
   extern function new();
   extern virtual function string   psdisplay (string prefix = "");
   extern virtual function vmm_data allocate  ();
   extern virtual function vmm_data copy      (vmm_data to = null);
   extern virtual function void     copy_data (vmm_data to = null);
   extern virtual function bit      compare   (vmm_data      to,
                                               output string diff,
                                               input int     kind = -1);
 
   extern  function void post_randomize();
endclass : packet
 
`vmm_channel(packet)
`vmm_atomic_gen(packet,"atomic_gen")
 
 
function packet::new();
   super.new();
endfunction
 
 
function string packet::psdisplay(string prefix);
  $write( psdisplay, "[%s] vari = 32'h%h; vari2 = 32'h%h\n",prefix, vari, vari2 );
endfunction
 
function vmm_data packet::allocate();
   packet i = new();
   allocate = i;
endfunction
 
function vmm_data packet::copy(vmm_data to);
   packet cpy;
   if (to == null)
      cpy = new();
   else
      if (!$cast(cpy,to)) begin
          copy = null;
         return copy;
      end
   copy_data(cpy);
   copy = cpy;
endfunction
 
function void packet::copy_data(vmm_data to);
   packet cpy;
   super.copy_data(to);
   if (!$cast(cpy, to)) begin
      return;
   end
endfunction
 
function bit packet::compare (vmm_data      to,
                                output string diff,
                                input int     kind);
   string str;
   compare = 1;
 
   return compare;
endfunction
 
function void packet::post_randomize();
  super.post_randomize();
endfunction
 
 
 
program test_atomic_gen;
 
  packet_atomic_gen pkt_gen = new("atomic_gen", "test");
  packet            pkt;
  
  initial 
  begin
    pkt = new();
    pkt_gen.stop_after_n_insts = 4; 
    pkt_gen.randomized_obj.vari.rand_mode(1); //vari to be randomized everytime
    pkt_gen.randomized_obj.vari2 = 32'h1234_5678;
    pkt_gen.randomized_obj.vari2.rand_mode(0);//turn-off vari2 randomization with a configured value.
    $display( "time: %t", $time );
    #100; 
    pkt_gen.start_xactor(); 
  end 
 
  initial 
  begin
    #200;
    forever 
    begin 
      $display( "time: %t", $time );
      pkt_gen.out_chan.get(pkt); 
      pkt.psdisplay(); 
    end 
  end
endprogram:test_atomic_gen
`endif //TEST_ATOMIC_GEN_SV_