question related to mavros

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Hi I want to ask sometihing. first, I got error when I used this command $ roslaunch px4 mavros_posix_sitl.launch and here is the error

... logging to /home/abdularis/.ros/log/27a0f1d6-ba3a-11e7-bf7a-94e9799ce369/roslaunch-abdularis-9598.log

Checking log directory for disk usage. This may take awhile.

Press Ctrl-C to interrupt

Done checking log file disk usage. Usage is <1GB.

Invalid <arg> tag: mavros_sitl_gazebo

ROS path [0]=/opt/ros/kinetic/share/ros

ROS path [1]=/home/abdularis/catkin_ws/src/mavlink

ROS path [2]=/home/abdularis/catkin_ws/src/mavros/libmavconn

ROS path [3]=/home/abdularis/catkin_ws/src/mavros/mavros_msgs

ROS path [4]=/home/abdularis/catkin_ws/src/mavros/mavros

ROS path [5]=/home/abdularis/catkin_ws/src/mavros/mavros_extras

ROS path [6]=/home/abdularis/catkin_ws/src/Firmware

ROS path [7]=/home/abdularis/catkin_ws/src/mavros/test_mavros

ROS path [8]=/opt/ros/kinetic/share

ROS path [9]=/home/abdularis/catkin_ws/src/Firmware

ROS path [10]=/home/abdularis/catkin_ws/src/Firmware/Tools/sitl_gazebo.

Arg xml is <arg default="$(find mavros_sitl_gazebo)/worlds/empty.world" name="world"/>

The traceback for the exception was written to the log file

and the second question is I try another method to run gazebo and ros with mavros with this several command that I got from dev px4 site

$ roslaunch mavros px4.launch fcu_url:="udp://:14540@127.0.0.1:14557"

$ no_sim=1 make posix_sitl_default gazebo

and when I call iris world file with this

$ roslaunch gazebo_ros empty_world.launch world_name:=$(pwd)/Tools/sitl_gazebo/worlds/iris.world

I got this error

INFO [logger] Start file log

INFO [logger] Opened log file: rootfs/fs/microsd/log/2017-10-26/09_53_24.ulg

INFO [mavlink] partner IP: 127.0.0.1

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

INFO [lib__ecl] EKF aligned, (pressure height, IMU buf: 15, OBS buf: 14)

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

INFO [lib__ecl] EKF GPS checks passed (WGS-84 origin set)

INFO [lib__ecl] EKF commencing GPS fusion

INFO [commander] home: 47.3977419, 8.5455938, 488.02

INFO [tone_alarm] home_set

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting offset.

ERROR [mavlink] [timesync] Hard setting ... (more)