Was getting the same thing, except I was only adding a js file, no styles. I checked the asset-builder globs and my added script was different than the others, because it was missing the assets folder prefixed to the path. It makes sense because in the screencast and on the asset-builder docs it’s going two directories up instead of three to get to plugins. So, concluding the “problem” here is that the “vendor” type starts in the theme folder not the assets folder - for some reason 
while “files” starts in the assets folder. Hope I have this right… seems to check out as I’ve just tried it.
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