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I KEEP GETTING FATAL ERROR WHEN I TYPE A51 AT MY COMMAND LINE.
I GET TERMINATED.
WHY?
I WILL READ THE MANAUL AND FIND LIST OF HOW TO WORKAROUND BUGS.
Then you will be looking in the wrong place.
What you call a "bug" is actually a completely normal behavior of the A51 compiler, and a typical reaction to insufficient or wrong command line arguments given by the user (that means "by you").
You need to read the parts of the manual concerning the normal usage of the A51 compiler - i.e. what command line options it expects and needs to do its job (convert an assembly file to an object code file).