Yeah, I think this is the cause. I have a full path in mine that isn't in yours and it's causing issue in the code. A work around for now is to open the yml file and in the "pref-path" entry put the full path to the folder the emulator is located in. Save the file and then try to import again in LB. Alternatively you can rename/move that file out of that directory, run the import and put it back. I've noted the problem location in code and it should be corrected in the next beta release.