ROS Error: Cannot Launch Node of Type

问题描述:ERROR: cannot launch node of type [ORB_SLAM/ORB_SLAM]: ORB_SLAM

原因:
This means that 

roslaunch

 cannot find the executable file 

ORB_SLAM

 anywhere in the 

ORB_SLAM

 package. Now, it's not clear to me why that's the case, but a common issue is that users do not source the 

setup.bash

 file after building which allows tools like 

roslaunch

 to find things like this. So presumably you built the workspace containing 

ORB_SLAM

 and that would have generated this 

setup.bash

 file somewhere. But without more information on how you built or installed this package you want to use, it's hard to help you further.

原因是安装好OPB_SLAM包后没有source setup.bash文件,不能把相关的环境变量,包的路径加载进来,导致ROS不能找到对应的节点
解决办法:source ~/catkin_ws/devel/setup.bash