I KEEP GETTING FATAL ERROR WHEN I TYPE A51 AT MY COMMAND LINE.
I GET TERMINATED.
WHY?
DOES ANYONE KNOW WHERE IN THE MANUAL IT HAS A INDEX OF BUGS?
Err ... nowhere. That wouldn't really make sense, since documenting a bug would make it an undesired feature, wouldn't it ?
And once again, what you are seeing is not a bug. It is a normal, expected reaction of the assembler to wrong or insufficient input data. It then prints an error message.
Yyou can find a list of error messages in the manual.
http://www.keil.com/support/man/docs/a51/a51_errors.htm
More precisely, the error message you are seeing can be found on this page, along with a description of what causes it.
http://www.keil.com/support/man/docs/a51/a51_er_messages.htm