Problem with "forrtl" when running bash script on open terminal window

I wrote a bash scrip that download files from internet and then run a software called Wavewatch (which is compiled with Intel Fortran Compiler) to do some process using downloaded files. The problem is that when I run the script using crontab (which runs in background without any open terminal window), everything goes well, but when I run the command manually in a Terminal window, a software module (called ww3_outp) returns an error complaining about writing problem of /dev/pts/0 looks like this:

forrtl: severe (38): error during write, unit 6, file /dev/pts/0
Image              PC                Routine            Line        Source
ww3_outp           00000000004AFEDB  Unknown               Unknown  Unknown
ww3_outp           0000000000408A6A  Unknown               Unknown  Unknown
ww3_outp           0000000000408236  Unknown               Unknown  Unknown
libc.so.6          000000347D81ED1D  Unknown               Unknown  Unknown
ww3_outp           0000000000408129  Unknown               Unknown  Unknown

I looked to /dev/pts/ and found that with each instance of Terminal window a file named by a number (0,1,2,...) is produced which can't be edited or deleted even with root permission. It seems so weird, any idea?