The issue there is with the Rigify script. Not Bone breaker or anything I have control over.
Perhaps, your file is an older rig that you opened within the new version?
Rigify creates a rig ID which is obviously not being found (or so the error reads).
I would suggest starting from scratch, import the mannequin and generate the rig, see if that works.
I haven’t tried the version you are on, everything works fine up to 2.80.75