Mpi Error

cliff@ubuntu:~/Documents$ vi test.c
cliff@ubuntu:~/Documents$ rm test.exe test.o
cliff@ubuntu:~/Documents$ mpicc -c test.c
cliff@ubuntu:~/Documents$ mpicc -o test.exe test.o
cliff@ubuntu:~/Documents$ ls
erg2    erg3.exe  erg4.c                    MPI_NOTES.pdf  test.exe
erg3.c  erg3.o    mpi-1.1-report-marked.ps  test.c         test.o
cliff@ubuntu:~/Documents$ mpirun -np 5 test.exe
Alarm clock
cliff@ubuntu:~/Documents$


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cliff@ubuntu:~/Documents$ cat test.c
#include <mpi.h>
#include <stdio.h>
#include <unistd.h>
int main (int argc, char * argv[0]) {

char message [16] = "Hello World !!";
MPI_Init (&argc, &argv);
printf ("%s\n", message);
MPI_Finalize();

return (0); }
cliff@ubuntu:~/Documents$