Nerocmd - no track given - error



:cop: I am using nerocmd in order to burn all files under a specific directory.
I am using the following command line parameters:
nerocmd.exe --write --drivename E --iso PETCT --real d:\cd_for_dicom\ct*.* --error_log MyErrorlog.txt --enable_abort --no_user_interaction --close_session --underrun_prot

and obtaining an error message : No tracks given

when i am adding the parameter --tao then I am obtaining an error concerning my media type : Your media is CD-R while a CD-RW is expected.

I am a novice in using nerocmd and would thank anybody that can suggest some help.