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Got a packet bigger than 'max_allowed_packet' bytes

ref: http://dev.mysql.com/doc/refman/5.0/en/packet-too-large.html

this is due to the packet limit of mysql server (have more details
from MySQL documentation:
http://dev.mysql.com/doc/mysql/en/packet-too-large.html ), you can add
extra entry into /etc/my.cnf:

max_allowed_packet = 100M

and restart mysql server on that machine, this will reset the
limitation to 100Mb for file insertion into blob type (or longblob)
column.