I'm on Project 2013 and have exported data from my Resource Pool into Excel via Visual Reports successfully for about 2 months now. Today, 5 of my 10 resources are missing. I'm also getting an error that a local cube file (.cub) is missing.
Last week, I did many updates to my computer. Thinking that Project got somewhat corrupted, I did a Repair, but I'm still getting my errors.

Are you re-using the same cube file or creating a new report? I'm guessing the 5 resources that are missing do have work assigned? What updates did you do to your computer?