Freepbx 13 upgrade error

trying to upgrade from freepbx 13 to freepbx 14, following the instructions at:
https://wiki.freepbx.org/display/PPS/Upgrading+from+FreePBX+10.13.66+to+SNG7
I get an error says:
’utf8’ codec can’t decode byte 0xe7 in position 2213465: invalid continuation byte
I’ve attached /var/log/sngupdate. I have tried to google this but can’t find anything relevant to freepbx. thanks for any help
./var/log/sngupdate

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