Did you also decrypt the audio files? RPGM also threw up an error for me if I tried to run the game via the editor with only the images decrypted.
You must be registered to see the links
(v1.21) with images and audio decrypted; the rar is much larger than normal since I left the encrypted files in. If you run the game via the editor be sure to hit F1 to turn off Rapid Mode. Oh, also, I made Lico start at level 24 to make sure the game didn't explode as soon as you changed
anything in RPGM (I've seen it happen) and forgot to change it back. I only sped through the tutorial though, so things may still explode later.