view_mrobot_gazebo.launch可以正常运行，view_mrobot_with_camera_gazebo.launch运行gazebo中无法加载机器人模型，终端报错[ERROR] [1689669689.379560386]: Failed to build tree: parent link [plate_2_link] of joint [camera_joint] not found.，已经把mrobot_with_camera.urdf.xacro中的<mrobot_body/>改为<xacro:mrobot_body/>还是报同样的错误（在用mrobot_description启动rviz时遇到这个错误添加xacro:后可以正常加载机器人）是gazebo的问题吗，怎么解决