Error after installed USB dongle

I am not aware how this error occurred after installing the RNDIS USB Dongle for the WAN connection https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_rndis

There were no error installed the opkg
opkg update
opkg install kmod-usb-net-rndis usb-modeswitch

After logging back to the OpenWrt

#### TypeError
Cannot read properties of null (reading 'dnsmasq')
SyntaxError
Unexpected token '&&'
  in http://172.16.1.1/luci-static/resources/form.js?v=git-23.119.80898-65ef406:?
  at http://172.16.1.1/luci-static/resources/luci.js?v=git-23.119.80898-65ef406:179:29
  at async Promise.all (index 3)

What is your thought of these error?

Have you checked the related file?
Let's see the contents of /etc/config/dhcp

The dhcp was working well without any changes before making the USB dongle installation.

config dnsmasq
        option domainneeded '1'
        option localise_queries '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
        option localservice '1'
        option ednspacket_max '1232'
        option rebind_protection '0'
        option confdir '/tmp/dnsmasq.d'
        list server '127.0.0.1#5453'
        option noresolv '1'
        list notinterface 'pppoe-wan'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
root@ea8100:/etc/config#


That DHCP file is missing a lot of stuff.... the lan DHCP server isn't even fully defined -- it must have a limit value. Something is wrong there.

Sorry, this is the complete file, earlier was a partial setting because I didn't adjust my screen size.

config dnsmasq
        option domainneeded '1'
        option localise_queries '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
        option localservice '1'
        option ednspacket_max '1232'
        option rebind_protection '0'
        option confdir '/tmp/dnsmasq.d'
        list server '127.0.0.1#5453'
        option noresolv '1'
        list notinterface 'pppoe-wan'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option leasetime '12h'
        option dhcpv4 'server'
        option dhcpv6 'server'
        option ra 'server'
        list ra_flags 'managed-config'
        list ra_flags 'other-config'
        option limit '50'

config dhcp 'wan'
        option interface 'wan'
        option ignore '1'

config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'
        option loglevel '4'

config dhcp 'guestwifi'
        option interface 'guestwifi'
        option leasetime '12h'
        option start '150'
        option limit '50'