This looks like the issue:
May 6 10:52:15 LeRoi emhttp: writing GPT on disk (sdo), with partition 1 offset 64, erased: 0 (Drive related)
May 6 10:52:15 LeRoi emhttp: shcmd (668): sgdisk -Z /dev/sdo $stuff$> /dev/null (Drive related)
May 6 10:52:15 LeRoi emhttp: _shcmd: shcmd (668): exit status: 1 (Other emhttp)
May 6 10:52:15 LeRoi emhttp: shcmd (669): sgdisk -o -a 64 -n 1:64:0 /dev/sdo |$stuff$ logger (Drive related)
May 6 10:52:15 LeRoi logger: sgdisk: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.11' not found (required by sgdisk) (System)
It is usually cause by an incompatible add-on. Start up in SAFE-MODE.