Question [Q] HELP PLS! Error updating from 4.4 to 4.4.2

I have a rooted Nexus 7 2013 LTE with TWRP. When I tried to update from 4.4 to 4.4.2, it gave me an error saying there's unexpected contents in /system/bin/ping6

I've tried both auto updating directly from server and manually update from downloaded zip file. It gave me the same error msg.

Anyone knows how to fix it? Thanks!