I bet you see the same error on the WebDAV too. Anything you did to the web server recently that leads to this error? Just curious.
You can test if your web server is ok, enable SSH, "Services->Terminal->Enable SSH service" prior, leave the port default 22. Use putty for Windows or Terminal for Mac to SSH into the NAS root@your_nas_ip then run: "apache2 -t" to test if it's ok or if there's any misconfiguration, share it here so we can work it out.
The first file it reads when you click on one of these Services tabs is the /volume0/usr/builtin/etc/apache2/asustor.conf even if it doesn't exist it will create a new one. I suspect your whole path doesn't exist or corrupted.
What you can do is to backup this path if it exist:
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mv /volume0/usr/builtin/etc/apache2 /volume0/usr/builtin/etc/apache2.bak
Copy over from the default:
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cp -a /volume0/usr/builtin/etc.default/apache2 /volume0/usr/builtin/etc/
Check again those tabs, if everything ok you may remove the backup:
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rm -rf /volume0/usr/builtin/etc/apache2.bak
The above needs some experience with Linux, I can't remember if Asustor prevents updating to the same firmware, which you could also try before doing the above. Go to
https://www.asustor.com/en/service/down ... duct_id=43 and download the current firmware you have, then update it from "Settings->ADM Update->Manual Update". Take note I see there's a V2 of your AS1004t ensure you get the correct one.