[RenderEngine.cc:89] Unable to create X window. Rendering will be disabled

[nicko369]

Running this package in a docker container
Built the dockerfile and ran the container using

docker run -td --privileged --net=host --ipc=host
--name="tello12"
--gpus=all
-e "DISPLAY=$DISPLAY"
-e "QT_X11_NO_MITSHM=1"
-v "/tmp/.X11-unix:/tmp/.X11-unix:rw"
-e "XAUTHORITY=$XAUTH"
-e ROS_IP=127.0.0.1
-e NVIDIA_DRIVER_CAPABILITIES=all
--cap-add=SYS_PTRACE
tello1 bash

However, running the container normally (docker run -it tello1 bash) also produces the same result,

[gazebo-1] [Msg] Waiting for master.
[gazebo-1] [Msg] Connected to gazebo master @ http://127.0.0.1:11345
[gazebo-1] [Msg] Publicized address: 172.17.0.2
[gazebo-1] [Wrn] [GuiIface.cc:298] Couldn't locate specified .ini. Creating file at "/root/.gazebo/gui.ini"
[gazebo-1] [Err] [RenderEngine.cc:749] Can't open display:
[gazebo-1] [Wrn] [RenderEngine.cc:89] Unable to create X window. Rendering will be disabled
[gazebo-1] [Wrn] [RenderEngine.cc:292] Cannot initialize render engine since render path type is NONE. Ignore this warning ifrendering has been turned off on purpose.
[gazebo-1] [Wrn] [GuiIface.cc:120] could not connect to display
[gazebo-1] [Msg] Could not load the Qt platform plugin "xcb" in "" even though it was found.
[gazebo-1] [Err] [GuiIface.cc:124] This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
[gazebo-1]
[gazebo-1] Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.