Yeah, the log file errors are normal when running like that.
The crash is in core tcl, it’s not specific to piaware. It smells familar, see here: problem with piaware 3.1.0
Have you done anything that would disable ipv6?
edit: I can reproduce your crash on current raspbian/piaware if I blacklist ipv6, as mentioned in the topic linked above, so it hasn’t been fixed upstream in the meantime. Workaround is the same: reenable IPv6 or comment out the IPv6 addresses in /etc/hosts.