I get a similar error message occasionally. I have a Roland V-Studio 100 as an interface. Here is a copy of a support message I got back in 2012 that still works for me:
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Hello,

The RDAW.DLL file is a file belonging to a cakewalk/edirol/roland soundcard. My advice is to close Band-in-a-Box and unplug the soundcard. Then delete the following files out of the BB folder

Mysetup.DK
Intrface.bbw

At this point open Band-in-a-Box and when you get to the main after clicking ok on the setup dialogs, close Band-in-a-Box, plug in the soundcard and wait for a good 10seconds. Then open Band-in-a-Box and set it up to use the dedicated soundcard that was producing the error again.

Thanks,
Rob
PG Music Inc.
www.pgmusic.com
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Don L. Turner

BIAB Audiophile 2021
Studio One 4