How to install and run openni_tracker for Hydro

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Thank you in advance for your help and patience. I am new to ROS and could use some help with openni_tracker and the Microsoft Kinect. I'm am using Ubuntu 12.04 and ROS Hydro

I have installed openni_camera and openni_launch according to openni_camera:

$ sudo apt-get install ros-hydro-openni-camera
$ sudo apt-get install ros-hydro-openni-launch
$ rosdep update

I have no problems running openni_launch and viewing the point cloud data, color image, or disparity view using Rviz and image_view.

I have installed openni_tracker:

$ sudo apt-get install ros-hydro-openni-tracker
$ rosdep update
$ roslaunch openni_launch openni.launch
$ rosrun openni_tracker openni_tracker

and get an error

[ERROR] [1416949546.535139208]: Find user generator failed: This operation is invalid!

I've uninstalled ROS (both Groovy and Hydro) with

$ sudo apt-get remove ros-<distro>

and still the problem comes up. I've read in a few threads that I should install NITE dev or something to help. But have also noticed that it hasn't helped some people.

Again, I am new to this, so some step-by-step help would be much appreciated. Thanks in advance.

UPDATE: I've also installed openni2_tracker...located in ~/catkin_ws/src/. When I go back to my catkin_ws and use catkin_make, I get the following errors:

-- ==> add_subdirectory(openni2_tracker)
CMake Error at /opt/ros/hydro/share/catkin/cmake/catkinConfig.cmake:75 (find_package):
  Could not find a configuration file for package orocos_kdl.

  Set orocos_kdl_DIR to the directory containing a CMake configuration file
  for orocos_kdl.  The file will have one of the following names:

    orocos_kdlConfig.cmake
    orocos_kdl-config.cmake

Call Stack (most recent call first):
  openni2_tracker/CMakeLists.txt:3 (find_package)


-- Using these message generators: gencpp;genlisp;genpy
-- /usr/lib/libOpenNI2.so
status
status
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
Nite2_INCLUDEDIR
   used as include directory in directory /home/ecejames01/catkin_ws/src/openni2_tracker
Nite2_LIBRARY
    linked by target "openni2_tracker" in directory /home/ecejames01/catkin_ws/src/openni2_tracker

-- Configuring incomplete, errors occurred!
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

I am not sure what this means or how to fix the problem...thanks for your help.