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I don't know why you're getting this error, your export
command looks right to me. Anyway, as you said, probably something is wrong with ROS_PACKAGE_PATH.
Please open a new terminal and type the following command:
echo $ROS_PACKAGE_PATH
This command will return the current paths that ROS looks for packages when you call commands such as rosmake
.
Check if in the output it's included the path for your packages.
If not, try using the command source /opt/ros/hydro/setup.bash
. After that, open a new terminal a try the first command again, the ROS_PACKAGE_PATH should have changed back for its default value.
Finally, try using the rosmake
command again.