rewind function in c

/* program to understand the use of rewind() */
#include<stdio.h>
#include<stdlib.h>
int main()
{
FILE *fptr;
fptr=fopen("stu","rb+");
if (fptr==NULL)
{
printf("Error when open file \n" );
exit (1);
}
printf("position indicator--%ld\n", ftell(fptr));
fseek(fptr,0,3);
printf("position indicator--%ld \n", ftell(fptr));
rewind(fptr);
printf("position indicator-- %ld \n", ftell(fptr));
fclose(fptr);
return 0;
}

Error when open file