Dreamcast emulator

Hi, I am having some issues with the DEMul emulator. Trying to launch Soul Calibur (love that game) after installing the BIOS and all that, and I return an error that says "unable to find 'mpr-23588.ic501' in romset 'dc'." Any idea what I could be doing wrong here/how to fix it? I'd love to try and see if this works on my PC. "Comfort the afflicted and afflict the comfortable."