# Gazebo Classic takeoff issues and errors **URL:** \ **Category:** PX4 Autopilot\ **Created:** [July 28, 2024, 2:48pm UTC](https://discuss.px4.io/t/gazebo-classic-takeoff-issues-and-errors/39907 "2024-07-28T14:48:29Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![iftikharumrani](https://discuss.px4.io/user_avatar/discuss.px4.io/iftikharumrani/32/16774_2.png) [@iftikharumrani](https://discuss.px4.io/u/iftikharumrani)\ **Post date:** [July 28, 2024, 2:48pm UTC](https://discuss.px4.io/t/gazebo-classic-takeoff-issues-and-errors/39907/1 "2024-07-28T14:48:29Z")
Hi folks, I am using WSL 2 “Ubuntu 20.04”, successfully cloned PX4 autopilot by following [instruction.](https://docs.px4.io/main/en/dev_setup/dev_env_windows_wsl.html) I’m trying to run the [gazebo classic](https://docs.px4.io/main/en/sim_gazebo_classic/) simulation, but its not making any progress, can be seen in the following **Errors summary:** _Warning [parser.cc:833] XML Attribute[version] in element[sdf] not defined in SDF, ignoring._ [Err] [RenderEngine.cc:749] Can’t open display: [Wrn] [RenderEngine.cc:292] Cannot initialize render engine since render path type is NONE. Ignore this warning if rendering has been turned off on purpose. [Wrn] [GuiIface.cc:114] could not connect to display [Msg] Could not load the Qt platform plugin “xcb” in “” even though it was found. [Err] [GuiIface.cc:118] This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb. WARN [health\_and\_arming\_checks] Preflight Fail: ekf2 missing data _ **Detailed response** _ iftikhar@DESKTOP-GH9UI2B:~/PX4-Autopilot$ make px4\_sitl gazebo-classic [0/4] Performing build step for ‘sitl\_gazebo-classic’ ninja: no work to do. [3/4] cd /home/iftikhar/PX4-Autopilot/build/px4\_sitl\_defau…opilot /home/iftikhar/PX4-Autopilot/build/px4\_sitl\_default SITL ARGS sitl\_bin: /home/iftikhar/PX4-Autopilot/build/px4\_sitl\_default/bin/px4 debugger: none model: iris world: none src\_path: /home/iftikhar/PX4-Autopilot build\_path: /home/iftikhar/PX4-Autopilot/build/px4\_sitl\_default GAZEBO\_PLUGIN\_PATH :/home/iftikhar/PX4-Autopilot/build/px4\_sitl\_default/build\_gazebo-classic GAZEBO\_MODEL\_PATH :/home/iftikhar/PX4-Autopilot/Tools/simulation/gazebo-classic/sitl\_gazebo-classic/models LD\_LIBRARY\_PATH :/home/iftikhar/PX4-Autopilot/build/px4\_sitl\_default/build\_gazebo-classic empty world, setting empty.world as default Using: /home/iftikhar/PX4-Autopilot/Tools/simulation/gazebo-classic/sitl\_gazebo-classic/models/iris/iris.sdf Warning [parser.cc:833] XML Attribute[version] in element[sdf] not defined in SDF, ignoring. SITL COMMAND: “/home/iftikhar/PX4-Autopilot/build/px4\_sitl\_default/bin/px4” “/home/iftikhar/PX4-Autopilot/build/px4\_sitl\_default”/etc * * * | \_\_\_ \ \ \ / / / | | |_/ / \ V / / /| | | \_\_/ / \ / /_| | | | / /^\ \ \_\_\_ | \_| / / |\_/ px4 starting. INFO [px4] startup script: /bin/sh etc/init.d-posix/rcS 0 INFO [init] found model autostart file as SYS\_AUTOSTART=10015 INFO [param] selected parameter default file parameters.bson INFO [param] selected parameter backup file parameters\_backup.bson SYS\_AUTOCONFIG: curr: 0 → new: 1 SYS\_AUTOSTART: curr: 0 → new: 10015 CAL\_ACC0\_ID: curr: 0 → new: 1310988 CAL\_GYRO0\_ID: curr: 0 → new: 1310988 CAL\_ACC1\_ID: curr: 0 → new: 1310996 CAL\_GYRO1\_ID: curr: 0 → new: 1310996 CAL\_ACC2\_ID: curr: 0 → new: 1311004 CAL\_GYRO2\_ID: curr: 0 → new: 1311004 CAL\_MAG0\_ID: curr: 0 → new: 197388 CAL\_MAG0\_PRIO: curr: -1 → new: 50 CAL\_MAG1\_ID: curr: 0 → new: 197644 CAL\_MAG1\_PRIO: curr: -1 → new: 50 SENS\_BOARD\_X\_OFF: curr: 0.0000 → new: 0.0000 SENS\_DPRES\_OFF: curr: 0.0000 → new: 0.0010 Gazebo multi-robot simulator, version 11.14.0 Copyright (C) 2012 Open Source Robotics Foundation. Released under the Apache 2 License. > **[Gazebo](https://gazebosim.org/)** > > Simulation Driven Robotics. Iterate quickly on design concepts and control strategies with Gazebo's rich suite of tools, libraries, and cloud services. [Msg] Waiting for master. [Msg] Connected to gazebo master @ [http://127.0.0.1:11345](http://127.0.0.1:11345) [Msg] Publicized address: 172.28.34.171 [Err] [RenderEngine.cc:749] Can’t open display: [Wrn] [RenderEngine.cc:89] Unable to create X window. Rendering will be disabled [Wrn] [RenderEngine.cc:292] Cannot initialize render engine since render path type is NONE. Ignore this warning if rendering has been turned off on purpose. [Wrn] [GuiIface.cc:114] could not connect to display [Msg] Could not load the Qt platform plugin “xcb” in “” even though it was found. [Err] [GuiIface.cc:118] This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb. INFO [dataman] data manager file ‘./dataman’ size is 7872608 bytes INFO [init] PX4\_SIM\_HOSTNAME: localhost INFO [simulator\_mavlink] Waiting for simulator to accept connection on TCP port 4560 INFO [simulator\_mavlink] Simulator connected on TCP port 4560. INFO [lockstep\_scheduler] setting initial absolute time to 3884000 us INFO [commander] LED: open /dev/led0 failed (22) WARN [health\_and\_arming\_checks] Preflight Fail: ekf2 missing data INFO [uxrce\_dds\_client] init UDP agent IP:127.0.0.1, port:8888 INFO [mavlink] mode: Normal, data rate: 4000000 B/s on udp port 18570 remote port 14550 INFO [mavlink] mode: Onboard, data rate: 4000000 B/s on udp port 14580 remote port 14540 INFO [mavlink] mode: Onboard, data rate: 4000 B/s on udp port 14280 remote port 14030 INFO [mavlink] mode: Gimbal, data rate: 400000 B/s on udp port 13030 remote port 13280 INFO [tone\_alarm] home set INFO [logger] logger started (mode=all) INFO [logger] Start file log (type: full) INFO [logger] [logger] .//log/2024-07-29/11\_37\_42.ulg INFO [mavlink] MAVLink only on localhost (set param MAV\_{i}_BROADCAST = 1 to enable network) INFO [logger] Opened full log file: .//log/2024-07-29/11\_37\_42.ulg INFO [mavlink] MAVLink only on localhost (set param MAV_{i}\_BROADCAST = 1 to enable network) INFO [px4] Startup script returned successfully pxh\> INFO [commander] Ready for takeoff! pxh\> commander takeoff pxh\> INFO [commander] Armed by internal command INFO [navigator] Using default takeoff altitude: 2.5 m INFO [tone\_alarm] arming warning INFO [commander] Takeoff detected [Showing no progress after the final script] Can you please suggest the solutions.