QoS Miss Configuration

i wan't to prioritizing my device but got error on restart qos

ip6tables v1.8.3 (legacy): host/network `192.168.1.4' not found
Try `ip6tables -h' or 'ip6tables --help' for more information.
ip6tables v1.8.3 (legacy): host/network `192.168.1.4' not found
Try `ip6tables -h' or 'ip6tables --help' for more information.

Here my configuration

config interface 'rupadana'
	option classgroup 'rupadanagroup'
	option overhead '1'
	option enabled  '1'
	option upload 		10240
	option download 	10240

config classify
	option target 'prio1'
	option srchost '192.168.1.4'
	option comment 'RupadanaPriority'

config classgroup 'rupadanagroup'
	option classes 'prio1 prio5'
	option default 'prio5'

config class "prio1"
	option priority 5

config class "prio5"
	option priority  	6

Makes sense as the address is IPv4 and the ip6tables expect an IPv6.
Post the QoS configuration in preformatted text </>

the script /usr/lib/qos/generate.sh generates all rules with iptables and ip6tables, if both are installed. so iptables commands fail for ipv6 adresses and ip6tables commands for ipv4, but QoS is configured correctly.