Its a warning only, I got this also on a Ubutu install in a virtual machine. On another real computer, QRemoteControl starts without any error. However, I think this warning only means, that no icon shown in the task bar. You can open the configuration dialog by starting the application another time.
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME qremoteco 7582 shanttu 18r IPv4 1245980 0t0 UDP *:5487