The "incorrect length" error for (typically referring to the ROM file avp_14m.bin within the arcade game Aliens vs. Predator ) usually occurs when the ROM file size does not match what your specific version of the MAME (Multiple Arcade Machine Emulator) or FBNeo (FinalBurn Neo) emulator expects . Why this happens
? You aren't alone. This is a common issue for anyone using a modern version of MAME with an older ROM set. The Problem: avp14m incorrect length