Now, I know the first thing you guys'll think is "Oh my god, newb mapper. Search!" The thing is, I have searched, here, there, and everywhere.
"RE_LoadWorldMap: maps/[mapname].bsp not found" is an error that occurs when you're attempting to /map or /devmap a .bsp file that's not in a .pk3. However, in my case the .bsp is in a .pk3. I've checked over the .pk3 many times. The .bsp is a working one, the .arena is correct, and after much searching, I cannot find the answer to my problem.
I can supply specifics if needed.
Thank you,
Plague Bringer.