Calling function inside seq body

Error-[XMRE] Cross-module reference resolution error
testbench.sv, 15
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: seq_item.address = address;
 
 
 
Error-[XMRE] Cross-module reference resolution error
testbench.sv, 16
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: seq_item.data_bytes = new[4];
 
 
 
Error-[XMRE] Cross-module reference resolution error
testbench.sv, 17
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: seq_item.data_bytes = data_bytes;
 
 
 
Error-[XMRE] Cross-module reference resolution error
testbench.sv, 18
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: seq_item.byte_enable = new[4];
 
 
 
Error-[XMRE] Cross-module reference resolution error
testbench.sv, 19
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: seq_item.byte_enable = 4'hf;
 
 
 
Error-[XMRE] Cross-module reference resolution error
testbench.sv, 20
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: foreach (seq_item.data_bytes [i] ) begin
  seq_item.data_bytes[i] = address[(8 * i)+:0];
  seq_item.byte_enable[i] = data_bytes[(8 * i)+:0];
  end
 
 
 
Error-[XMRE] Cross-module reference resolution error
testbench.sv, 21
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: seq_item.data_bytes[i] = address[(8 * i)+:0];
 
 
 
Error-[XMRE] Cross-module reference resolution error
testbench.sv, 22
  Error found while trying to resolve cross-module reference.
  token 'seq_item'.  Originating package '$unit'.
  Source info: seq_item.byte_enable[i] = data_bytes[(8 * i)+:0];

class c1;
  rand byte unsigned byte_data[];
  rand longint unsigned address;
  rand bit byte_enable[];
 
  virtual task body();
    c1 seq_item;
    seq_item =new();
    $display("Write Done ...");
        //Call write function
    write(32'h0100_0814,32'h01);
  endtask :body
 
  function void write(int address, int data_bytes);
     seq_item.address                   = address;
     seq_item.data_bytes                = new[4];
     seq_item.data_bytes                = data_bytes;
     seq_item.byte_enable               = new[4];
     seq_item.byte_enable               = 4'hF;
     foreach(seq_item.data_bytes[i]) begin
       seq_item.data_bytes[i] = address[8*i +:0];
       seq_item.byte_enable[i] = data_bytes[8*i +:0];
       end
   endfunction    
endclass : c1