Does not start the server (Curse Dungeons, Dragons and Space Shuttles 4.13)

If you are using mods, and the server wont start, then it is most likely a broken mod, or maybe one of your mods need a support mod. So, to fix a modded server not starting, check you logs if there is a broken mod, then just delete that particular mod. However, if you are using a modpack, there is not much you can do, since you can not delete a separate mod in the modpack.
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A mod/modpack might run just fine when you started to use it. But it can break at any time. Some might not even start. Cause the more you use it, the more RAM you need, and since aternos has a RAM limit (Cant rly complain, its free) it will eventually give up and start to crash.
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We always try to get the best possible balance between our limited resources (since we are free and we don't want to change that) and the best performance. Especially for modpacks, this is really hard to achieve. We test the modpacks in our system to ensure that they are at least starting and that basic playing is possible. Because modpacks are always a bit different and the load on our host systems is also always different we cannot guarantee anything here. But we decided to still offer modpacks on our platform because we want to offer as many options to customise your server as possible and most of the modpacks are pretty playable most of the time.

I've been having the same problem with big modpacks like this one, and fyi, I have hosted the pack myself on my own PC with it port forwarded and it only takes up 1.5G of RAM to start up, contrarily I managed to have it running on Aternos once, in which I was allocated 2G RAM and it worked. Its very unlikely the fact that the pack is broken, since DDSS is stable and the server runs on 1.5G RAM (barely). Seems to me like the server gives up after the 5000 line of console since all logs stop there, its definitely something on Aternos' end but hey, its a hungry pack to host.