Downloaded DEmul x86 v0.7 BUILD 111117 was working fine, then I took a break. Came back and now I get this error every time I try to load a game: demul unable to find 'mpr-23588.ic501' in romset 'dc'. I have no idea what this error means any help on how to solve it and why it is happening would be appreciated?

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Just found a similar post on the Reddit forums explaining that this is related to the bios. Which reminded me I changed Dreamcast bios's, switched back to the default bios setting and every thing is working again.