gazebo ROS2 humble on ubuntu 22.04

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Hi everyone I've instalaled ROS2 Humble on Ubuntu 22.04. When trying to start Gazebo, I get the errors:

 $ gazebo --verbose /opt/ros/humble/share/gazebo_plugins/worlds/gazebo_ros_diff_drive_demo.world

Gazebo multi-robot simulator, version 11.10.2
Copyright (C) 2012 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org
[Msg] Waiting for master.
Gazebo multi-robot simulator, version 11.10.2
Copyright (C) 2012 Open Source Robotics Foundation.

Released under the Apache 2 License.
http://gazebosim.org
[Msg] Waiting for master.
[Msg] Connected to gazebo master @ http://127.0.0.1:11345
[Msg] Publicized address: 10.0.2.15
[Msg] Loading world file [/opt/ros/humble/share/gazebo_plugins/worlds/gazebo_ros_diff_drive_demo.world]
[Msg] Connected to gazebo master @ http://127.0.0.1:11345
[Msg] Publicized address: 10.0.2.15
[Msg] Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Wrn] [Server.cc:579] Waited 1seconds for namespaces.
[Err] [Server.cc:584] Waited 11 seconds for namespaces. Giving up.
[Err] [Node.cc:118] No namespaces found
[INFO] [1666326686.114445250] [gazebo_ros_node]: ROS was initialized without arguments.
    [INFO] [1666326686.252823429] [demo.diff_drive]: Wheel pair 1 separation set to [1.250000m]
    [INFO] [1666326686.253110570] [demo.diff_drive]: Wheel pair 1 diameter set to [0.600000m]    
[INFO] [1666326686.257526483] [demo.diff_drive]: Subscribed to [/demo/cmd_demo]    
[INFO] [1666326686.260001870] [demo.diff_drive]: Advertise odometry on [/demo/odom_demo]    
[INFO] [1666326686.263030123] [demo.diff_drive]: Publishing odom transforms between [odom_demo] and [chassis]    
[INFO] [1666326686.269774151] [demo.diff_drive]: Publishing wheel transforms between [chassis], [left_wheel_joint] and [right_wheel_joint]

and gazebo doesn't start. What am I missing? Thanks in advanced!