Workspace not properly overlayed by setup script

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First day with ROS, trying to configure the environment and following the beginner tutorial here:

http://wiki.ros.org/ROS/Tutorials/Ins...

Everything seemed to be working up until this point, I was able to create the catkin workspace.

$ mkdir -p ~/catkin_ws/src
$ cd ~/catkin_ws
$ catkin_make

These commands work and I was able to create the catkin workspace.

And I don't get an error when I run:

$ source devel/setup.bash

However, now when I run:

$ echo $ROS_PACKAGE_PATH
/home/youruser/catkin_ws/src:/opt/ros/kinetic/share

I get the error:

bash: /home/youruser/catkin_ws/src:/opt/ros/kinetic/share: No such file or directory

If it helps, I am running Linux Ubuntu 16.04 on Oracle VM VirtualBox

Any help with this would be greatly appreciated. Thank you.