ROS ——解决Unable to launch [xxx-2]

RLException: Unable to launch [xxx-2]. 
If it is a script, you may be missing a '#!' declaration at the top.
The traceback for the exception was written to the log file
 
# 匹配异常，无法运行 launch
# 如果是一个脚本，您可能缺少一个'#!'的声明。

直接将编译空间中的build和devel都删了，重新编译应该就不会有什么问题