This looks like memory corruption. Especially at start of program, this should be a one-time error. Let's ignore it for now, but definitely post if you crash like this again.
Reason: You crash in al_create_voice, which, according to the call stack, is called from al_stricmp. But al_stricmp is a side-effect-free function to compare text strings, it definitely won't call al_create_voice, a sound routine. Since the call stack looks like this nonetheless, I suppose corrupt memory. Maybe Allegro was badly loaded this time. Maybe you ran out of free RAM. Maybe the RAM hardware has become faulty, but that is rare. Maybe there is a weird bug in Allegro or its D bindings. Definitely ignore and only investigate if it happens more often.
-- Simon