DPI-C Simulation error

Hello to all,

 I'm new at SystemVerilog and i'm trying to create a way to use C code.  However, when i run the ncsim i obtain these following messages:

"ncsim: *F,NOLWSV: Unable to load the default library libdpi."
"OSDLERROR: ./libdpi.so: cannot open shared object file: No such file or directory or file is not valid ELFCLASS32 library.."

The c-program is a very simple one:

#include "svdpi.h"

void reportc()
{
printf("Hello World from C! ");
}

and the systemverilog code is:

 program main();
//string str;

import "DPI-C" reportc=task reportc();

initial
begin
  reportc();
end

endprogram

 Thanks for your help

Best Regards

Miguel Caetano