If you're on 4.87, I'd either use EvilNat CFW or just use HEN until Rebug gets an update.
Since you specifically asked about CFW, here's EvilNat's release thread:
[Edit]
Waiting a day or two may be a better choice as well. I believe BGTools is currently getting updated to handle 4.87, but I'm not a dev, nor involved with the project, so this is only hearsay, for what it's worth.