A$AP Rocky is dodging charges for bitch slapping a female fan, and it's because nobody can nail down the dude's whereabouts to serve him ... TMZ has learned.
We broke the story ... Lisa Wade claims the rapper smacked her in the face -- for no apparent reason -- as he made his way through the crowd at a Philly concert last month.
But since police didn't see it happen and it's a misdemeanor offense ... Wade had to file a PRIVATE criminal complaint with the D.A. -- which means the alleged victim has to give the D.A. contact info for the alleged assailant.
Problem is ... the paperwork was sent to A$AP's record company -- as Wade requested -- via certified mail, but he wasn't there to sign for it. Bottom line ... the docs were returned to sender.
Now the D.A.'s Office can't move forward ... until Wade provides a viable address where A$AP can get served with assault and harassment charges.