intended(till it runs...) but exits in between with an error;

In the program, the command for each node is given using a small bash file, 1-exec
2-exec etc....

error:
##########################
 rank 3 in job 83  sapphire.bw01.uic.edu_56332   caused collective abort of
 all ranks  exit status of rank 3: return code 0
######################################################

The code:

 #include "mpi.h"
 #include "stdio.h"
 #include <unistd.h>
 int main( int argc, char *argv[] )
 {
        int numprocs, myrank,work,namelen;
        char *file;
        char processor_name[MPI_MAX_PROCESSOR_NAME];



 MPI_Init(&argc, &argv );
 MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
 MPI_Comm_rank(MPI_COMM_WORLD,&myrank);


 if (myrank) printf("My process rank ==> %d\n",myrank);

 if (myrank==1)execl("/bin/bash","bash","1-exec",0);
 if (myrank==2)execl("/bin/bash","bash","2-exec",0);
 if (myrank==3)execl("/bin/bash","bash","3-exec",0);
 if (myrank==4)execl("/bin/bash","bash","4-exec",0);
 if (myrank==5)execl("/bin/bash","bash","5-exec",0);
 if (myrank==6)execl("/bin/bash","bash","6-exec",0);
 if (myrank==7)execl("/bin/bash","bash","7-exec",0);
 if (myrank==8)execl("/bin/bash","bash","8-exec",0);
 if (myrank==9)execl("/bin/bash","bash","9-exec",0);
 if (myrank==10)execl("/bin/bash","bash","10-exec",0);
 if (myrank==11)execl("/bin/bash","bash","11-exec",0);
 if (myrank==12)execl("/bin/bash","bash","12-exec",0);
 if (myrank==13)execl("/bin/bash","bash","13-exec",0);
 if (myrank==14)execl("/bin/bash","bash","14-exec",0);
 if (myrank==15)execl("/bin/bash","bash","15-exec",0);
 if (myrank==16)execl("/bin/bash","bash","16-exec",0);

 MPI_Finalize();
 }


 ****************************

 Any suggestions.??I tried to find out the possible cause of the error but
 it was discussed very less.All I could learn was that it might be due to
 less number of processing units,  but I cannot run the above program with
 even less number of processes for example I have atleast 6 processing
 units and running the program for even 1 would exit with the error.

 Thanks alot,

 Fahad Saeed