file stops at end due to errors

[R!pn8URn385]

trying to rip disc two of the two towers and i get a long list of errors. does anyone have any suggestions?

MakeMKV v1.17.8 darwin(x64-release) started
Optical drive "BD-RE PIONEER BD-RW BDR-S13JX 1.03 DEDL300610UCd" opened in OS access mode.
Using LibreDrive mode (v01.0 id=E9BA8ECC61EF)
Using direct disc access mode
Title #1 was added (40 cell(s), 2:08:30)
Title #2 was added (40 cell(s), 2:08:30)
Title #01 in VTS 1 is equal to title #02 and was skipped
Operation successfully completed
Saving 1 titles into directory /Volumes/My Passport/MKV movies
Error 'OS error - (ipc/send) invalid destination port' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '6140067840'
Error 'Posix error - Device not configured' occurred while reading '/dev/rdisk4' at offset '6140067840'
Error 'Posix error - Device not configured' occurred while reading '/dev/rdisk4' at offset '6140067840'
Error 'Posix error - Device not configured' occurred while reading '/dev/rdisk4' at offset '6140067840'
Error 'Posix error - Device not configured' occurred while reading '/dev/rdisk4' at offset '6140067840'
Error 'Posix error - Device not configured' occurred while reading '/dev/rdisk4' at offset '6140067840'
Error 'OS error - (ipc/send) invalid destination port' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '6140067840'
Error 'OS error - (ipc/send) invalid destination port' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '6140067840'
Error 'OS error - (ipc/send) invalid destination port' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '6140067840'
Error 'OS error - (ipc/send) invalid destination port' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '6140067840'
Error 'OS error - (ipc/send) invalid destination port' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '6140067840'
Error 'OS error - (ipc/send) invalid destination port' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '6140067840'
Failed to save title 0 to file /Volumes/My Passport/MKV movies/B1_t00.mkv
Encountered 11 errors of type 'OS X IPC Error' - see http://www.makemkv.com/errors/ipc/
0 titles saved, 1 failed

[dcoke22]

How is your drive powered? Is it in an external enclosure? And does that enclosure have its own power brick?