Error while loading nodelet [/velocity_multiplexer]

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Hi, I am using ROS fuerte version on Ubuntu 10.04. I use the velocity multiplexer (sudo apt-get install ros-fuerte-yujin-ocs) designed by YujinRobot(http://wiki.ros.org/cmd_vel_mux). I modify the one header file and one cpp file in the installed package, to incorporate one more subsrciber (so that nodelet manager subcribes to amcl_pose topic).

I compile the code and it gets compiled perfectly.

root@ubuntu:/opt/ros/fuerte/stacks/yujin_ocs/cmd_vel_mux# make

But when I RUN following command:

roslaunch cmd_vel_mux standalone.launch

The errors can be found below::

http://pastebin.com/XnUkXRCZ

Some files that you may be interested are given below:::::

CMakeList.txthttp://pastebin.com/FfJaZF7v

nodelet_plugins.xmlhttp://pastebin.com/S1ZxgW9M

header filehttp://pastebin.com/PcuNaWYm

Source cpp filehttp://pastebin.com/gZUfqEu3

manifest.xmlhttp://pastebin.com/vS0w7Tiq

Question1:: why the error says "Make sure that you are calling the PLUGINLIB_REGISTER_CLASS macro in the library code, and that names are consistent between this macro and your XML."???

Question2:: why new function APPEARS to be UNDEFINED?? Even if it is included in Header File and there is no problem in compiling the new package.

Please HELP

NOTE In CMakeLists.txt ( http://pastebin.com/zCzZ7fG6 ), even if we link directories explicitly, still '.so' file can't figure it out where the cpp or header file