So, my dad has this very very old Acroloc machine with a Fanuc 6M control, he has been trying to make it work for weeks now and when I tried to load up a program it stopped in the line referring to a tool change, then at the bottom where those letters:

LSK BUF INC

Is that a problem with tool changing? If I change the tools manually, could it run the program?

We are so new to this and any help would be great.