cannot launch node of type [closed]

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Hello everybody,

I've got trouble when trying to get my workspace-packages to run. I'm doing the following to build the workspace:

source /opt/ros/kinetic/setup.bash
cd catkin_ws
catkin_make
source ./devel/setup.bash

After that I try to launch the nodes, for example lms1xx

roslaunch lms1xx MRS1000.launch

, which is successfull.

Then I try to launch another node, for example the rosbridge node,

roslaunch rosbridge_server rosbridge_tcp.launch

but here I get the following errors:

ERROR: cannot launch node of type [rosbridge_server/rosbridge_tcp]: can't locate node [rosbridge_tcp] in package [rosbridge_server]
ERROR: cannot launch node of type [rosapi/rosapi_node]: can't locate node [rosapi_node] in package [rosapi]

When I try to launch one another node, here the node for pointcloud of zed-camera

roslaunch zed_pointcloud 2dscan.launch

I get a different error-message than befor:

ERROR: cannot launch node of type [pointcloud_to_laserscan/pointcloud_to_laserscan_node]: pointcloud_to_laserscan
ROS path [0]=/opt/ros/kinetic/share/ros
ROS path [1]=/home/serva-eve/catkin_ws/src
ROS path [2]=/opt/ros/kinetic/share

I'm a noob working with ROS. So I don't get why there are different error-messages and what they mean. I know that I have to source the .bash-file to get the right path, so I did that like I explained at the top.

Can please somebody help and tell me what the errors mean and what I can do to fix them.

Thank you very much in advance!