can't read sequential files

Hi, I'm using cygwin and windows XP together with Eclipse IDE and CDT. I have a following piece of code:

....

        int i;
        fp = fopen ("phi.txt","r");
       
        for( i = 0; i < 51; i++ ) {
                fscanf(fp, "%d\n", &original_phi[i]);
        }

...

and when I try to compile it, it compiles well, but when I try to run it I get the following error message:

655 [main] Genetics 3012 _cygtls::handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
2540 [main] Genetics 3012 open_stackdumpfile: Dumping stack trace to Genetics.exe.stackdump

I added the following line to check if fp is always NULL:

if (fp==NULL)
{
   printf("error, NULL pointer!\n");
   return(1);
}

and it is always NULL. I put the "phi.txt" in the same directory as the executable so it is in:

....\ProjectFolder\Debug  

folder as well as in

....\ProjectFolder\src

folder. I still keep getting the same error. I added the current directory "." to the PATH but it didn't help. This code used to run on another PC with Eclipse and cygwin again but this is the first time I am having problems with it on a different machine. Any help would be greatly appreciated.

Thanks.