I opened DreamMaker. I was adding a mob/proc calling from a world/proc as below.
proc/blah(mob/M)
M:mah()
mob/proc/mah()
world << "jah"
After that, It froze my computer and I had to restarted it. I relaunched DreamMaker when I rebooted my computer, and took away that M:mah() line and now, it won't even compile anymore.
EDIT: It's fixed now.