how to solve it, I need this certificate immediately
Check DNS / Check Spelling:
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DuckDNS is having issues recently with unreachable nameservers.
That's very unfortunate, but if this indeed is again a problem with DuckDNS, there's nothing Let's Encrypt or we, volunteers on this Community, can do about it.
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What should I do to fix it?
So the fault is in duckdns? well thank you
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We have been seeing problems with duckdns name servers more frequently lately.
You could post these problems at their support forum. Show them this link
https://dnsviz.net/d/ayuindahl.duckdns.org/dnssec/
and perhaps this one
https://dns.google/query?name=ayuindahl.duckdns.org&rr_type=A&ecs=
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what's that? I was confused 
About what? The duckdns servers are failing. You should report that to them.
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About the link you send. And sorry I didn't find the report column for duckdns
I am not a duckdns support person. But, you must have some kind of account there to have made a domain name so contact them however you would for other questions.
The two links I showed are something that might be helpful to them. Those exact links. They don't point to other things to send them - they are the links.
If you don't understand that it is fine. I was just trying to provide extra info to help you get your problem resolved. But, duckdns themselves are the best place to ask. Maybe even refer them back to this thread.
As you start to manage your own server there will be a lot to learn.
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I tried to log in to the duckdns group in the email and asked about it... just waiting for answer 
Thank you for answering and helping me!
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Alternatively you could use a different DDNS provider.
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Finally I managed to get a certificate, but my domain changed to https, how to get http but still have a certificate?
you can't: most people just set redirect traffic from http to https
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but my teacher asked me to make this
config saparate vhost for both version and think like thats different site
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I did, I created different directories and configurations. But when it comes to getting certified, boom... I lost my http 
certbot apache module will rewite apache config for their use, check it again
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If it's homework, you need to learn it yourself by reading the Apache documentation.
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