TeamSpeak 3 for the x86 platform (ReadyNAS Pro/NVX)

First off: At this point it is not confirmed to work for everyone, I've posted what worked for me.

Looks like you tried to run or ran Teamspeak under a dfferent user first (for example under the root user).

First make sure Teamspeak is completly shutdown, then check /dev/shm if there is file there. (There shouldn't be any when Teamspeak is shutdown). Make sure your user has the needed rights! The /dev/shm is essential in running Teamspeak 3 server, from the official documentation:

*** ATTENTION ***

In some cases, the server process terminates on startup and the error message reads 
"Server() error while starting servermanager, error: instance check error".

As long as you don't have a license key embededded we make sure you only run exactly 
one instance of the TS3 server free unregistered version. We use shared memory to 
facilitate the communication to detect other running instances, which requires tmpfs 
to be mounted at /dev/shm. If you (for whatever reason) do not have this mounted, the 
above error will occur.

To fix this problem, the following commands or file edits need to be done as root user 
(or using something like sudo). This is a temporary fix until your next reboot.

 mount -t tmpfs tmpfs /dev/shm

Now, to make sure this mount is done automatically upon reboot edit the file /etc/fstab 
and add the line:

 tmpfs /dev/shm tmpfs defaults 0 0

If that checks out, delete the entire teamspeak folder, redownload and untar again, Make sure to only start it using the command from my post.