Could you include a brief explanation of what suggested solutions you tried that did not work? This would save people from re-suggesting them here. Also, worth noting that the object is CF.mb not CF.md (which would suggest it was looking for a markdown file). I'm not familiar with the filetype, which, from what I've been able to find, is either: a binary scene file for AutoDesk Maya, or memo field values for a Paradox database.
It's also helpful to abstract the problem out a bit. Basically, you are calling for something in the post that isn't there. Once you figure out what that something is (is it possible there's a typo somewhere?), there are several threads here, and elsewhere that can help you get that sorted.
(@raybuhr has a helpful post referenced in that last thread that might be helpful).