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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.