Tor crashed during startup. This could be due to an error in your torrc file, a bug in Tor or another program on your system, or faulty hardware. Until you fix the underlying problem and restart Tor, the Tor Browser will not start.
@caos, yes, the both of them cannot run together unless you define a separate SOCKS port and CONTROL port (9150 and 9151 by default respectively). See: running-multiple-tor-browsers. Thanks for testing Tor Browser alpha!