That looks like this might be an error with the Font Bakery script, not the font.
Are you really testing an OTF, or is it a TTF? If it is indeed an OTF, then there wouldn’t be a loca table, so I’m not sure why the script would be trying to check one. And that’s why there would be a keyError.
Dave Crossland will likely come along and can comment.
P.S. — By “OTF”, I guess what I really mean is an “OTF with CFF outlines”, as opposed to “OTF with TrueType outlines.” Technically, they are both OpenType Fonts. As I’m sure someone will be quick to point out.
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pip3 install fontbakery