在执行roslaunch robot_sim_demo robot_spawn.launch指令的时候报错

[wadefrank]

This setting assumes you have an old package with an old implementation of DefaultRobotHWSim, where the robotNamespace is disregarded and absolute paths are used instead.
If you do not want to fix this issue in an old package just set <legacyModeNS> to true.

以上是报错信息

[renyuehe]

我也是这个问题