FFT Crashing when dismissing unit

[Baelfire]

Hello, I've been doing a bit of modding of FFT 1.3 (changing skills/adding sprites) and I've found a bug I've never dealt with before. Whenever I try to dismiss the starting squire units, the game crashes with the error 'unknown opcode 000CFFFB at 00000010'. I've done this kind of modding before and never ran into this issue. It's right after the gariland fight, in the first chapter after the Orbonne fight. I added a few guest characters to that fight to join after.

So far I'm stumped and unsure what the fix is. Any help would be appreciated.