I saw this error in other places, tried running Tor in terminal as root. Got this error:

May 14 16:03:06.565 [notice] Initialized libevent version 2.0.16-stable using method epoll. Good.
May 14 16:03:06.565 [notice] Opening Socks listener on 127.0.0.1:9050
May 14 16:03:06.565 [warn] Could not bind to 127.0.0.1:9050: Address already in use. Is Tor already running?
May 14 16:03:06.567 [notice] Opening Control listener on /var/run/tor/control
May 14 16:03:06.567 [notice] Closing partially-constructed listener Control listener on /var/run/tor/control:0
May 14 16:03:06.568 [warn] Failed to parse/validate config: Failed to bind one of the listener ports.
May 14 16:03:06.568 [err] Reading config failed--see warnings above.


then I did::~$ ss -aln | grep 9050
LISTEN 0 128 127.0.0.1:9050 *:*

9050 is highlighted in red.

Any clues on what this error means?