RLException: [marm.launch] is neither a launch file in package [mobot_urdf] nor is [mobot_urdf] a launch file name

[zhouyiran-la]

执行：

$ roslaunch mobot_urdf marm.launch

有如下报错：

RLException: [marm.launch] is neither a launch file in package [mobot_urdf] nor is [mobot_urdf] a launch file name
The traceback for the exception was written to the log file

发生此错误的原因可能是在创建ROS工作空间时没有将devel/setup.bash写入~/.bashrc，导致后期找不到marm.launch文件，解决办法如下：

$ cd ~/catkin_ws/
$ source devel/setup.bash

[hilinxinhui]

类似问题大多与环境变量有关，请参考第一期文档中“配置PX4&ROS环境”部分。