C51 FATAL-ERROR - ACTION: PARSING SOURCE-FILE ERROR: PREPROCESSOR: MACROS TOO NESTED C51 TERMINATED.
PLEASE TELL ME HOW TO SOLVE THIS ERROR.
instead of banging back and forth, why do you not post your code in a readable (see instructions) form
Look at this picture: www.danlhenry.com/.../keil_code.png - follow the instructions.
If that's not clear, try following the link, "Tips for Posting Messages".