So erlang-nox was installed along that as a dependency?
Can you please try building it from the ABS (or your equivalent) and install that, to check if it has the same problem?
To be honest, I fear this is related to your operating system and platform combination. You might need seek out for support in the arch linux arm community.
Still, could you please check the output of pacman -Q erlang-nox?
Preferably you build it from the ABS first and check if it works then. This way we could learn if there is an error in the uploaded package or if it is the package build instructions that may be faulty.
Only if that fails, try to remove erlang and elixir from your system and build them from the very scratch.
If at least one of this actually works and makes you ending up with a working version of erlang, you might need to seek support in the arch linux arm community to actually repair the packages.