ubunutu server 18 network problem

im new to ubuntu server
i just installed ubuntu server with apache and webmin/virtualmin , i use “CDN provider” to manage my DNS records after i reboot my server i get following error :

/lib/systemd/system-generators/netplan failed with exit status 1
found ordering cycle on network-pre.target/start
found dependency on firewalld.service/stop
found dependency on basic.target/start
found dependency on paths.target/start
found dependency on acpid.path/start

i googled my problem i think i should change setting in netplan config yaml file
but i dont know what should i change ?

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Author: user3636770