The dnfs120-201666.rom was removed from bbcb.zip in MAME 0.216, so updating your MAME will solve that issue. Or you can copy dnfs120.rom from your bbc_acorn8271.zip into bbcb.zip.
You also have an incorrect checksum for saa5050, this was updated over a year ago so you need to find a newer saa5050.zip too.
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