Error while running nodelet: cannot load library, undefined symbol

edit

I am trying to create a nodelet out of an existing node with the header file gridmapping_nodelet.h given as

#ifndef GRIDMAPIING_NODELET_H
#define GRIDMAPIING_NODELET_H
#include <gridmapping/gridprocess.h>
#include <missiondata/dem.h>
#include <ros/ros.h>
#include <nodelet/nodelet.h>

//namespace TX
//{

namespace gridmapping_nodelet
{

  class gridmapping : public nodelet::Nodelet
  {
     public:
     gridmapping(){};
     virtual void onInit();
     ~gridmapping();
     private:
     ros::NodeHandle * n;
     double maxrange;
     double cellsize;
     int gridsize;
     TX::GridProcess* process;

  //subcribe to pose and lidar data
     ros::Subscriber pose;
     ros::Subscriber points;
     ros::Subscriber points2;
     ros::Subscriber stereo;

  //set publish frequency
     ros::Timer obst_publish_timer;
     ros::Timer marker_publish_timer;
  };
};
//};

#endif

and gridmapping_nodelet.cpp file is as follows

     #include <gridmapping_nodelet/gridmapping_nodelet.h>
     #include <pluginlib/class_list_macros.h>

     // watch the capitalization carefully

     PLUGINLIB_DECLARE_CLASS(gridmapping_nodelet, gridmappingn,gridmapping_nodelet::gridmapping, nodelet::Nodelet)    

     using namespace gridmapping_nodelet;

       void gridmapping_nodelet::gridmapping::onInit()
       {
           *n = getNodeHandle();
           n->getParam("/gridmapping/maxrange", maxrange);
           n->getParam("/gridmapping/cellsize", cellsize);

           gridsize = (6*maxrange)/cellsize;

           //this does the publishing and data processing
           process = new TX::GridProcess(*n, cellsize, maxrange, gridsize);
           //process = new TX::GridProcess(*n, 20, 400, 100);
           //subcribe to pose and lidar data
           pose = n->subscribe("/gridmapping/pose",0, & TX::GridProcess::updatePose, process);
           points = n->subscribe("/gridmapping/cloud", 5,& TX::GridProcess::updateGrid, process);
           points2 = n->subscribe("/gridmapping/cloud2", 5,& TX::GridProcess::updateGrid2, process);
           stereo = n->subscribe("/gridmapping/stereocloud", 5, & TX::GridProcess::updateGridStereo, process);

           //set publish frequency
           obst_publish_timer = n->createTimer(ros::Duration(0.25), &TX::GridProcess::publishObstacles, process);
           marker_publish_timer = n->createTimer(ros::Duration(0.25), &TX::GridProcess::publishMarkers, process);         

       }

nodelet_plugins.xml is given by

<library path="lib/libgridmapping">
<class name="gridmapping_nodelet/gridmappingn" type="gridmapping_nodelet::gridmapping" base_class_type="nodelet::Nodelet">
<description>
 This is gridmapping nodelet.
</description>
</class>
</library>

CMakeLists.txt

rosbuild_add_library(gridmapping src/gridmapping_nodelet.cpp)

manifest.xml

<export>
 <cpp cflags="-I${prefix}/include" lflags="-L${prefix}/lib -lgridmapping" />
 <nodelet plugin="${prefix}/nodelet_plugins.xml" />
</export>

launch file

  <launch>
    <node pkg="nodelet" type="nodelet" name="standalone_nodelet"  args="manager" output="screen"/>

    <node pkg="nodelet" type="nodelet" name="gridmapping" args="load gridmapping_nodelet/gridmappingn standalone_nodelet" output="screen">
    </node>                 
  </launch>

The parameters are defined in a separate launch file which calls on the launch file mentioned above.

The ouput error is as follows

[ERROR] [1323458052.686296083]: Failed to load nodelet [/gridmapping] of type  [gridmapping_nodelet/gridmappingn]: Failed to load library /home/aeroscout/ros/tx_stacks/tx_perception/gridmapping_nodelet/lib/libgridmapping.so. 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. Error string: Cannot load library: /home/aeroscout/ros/tx_stacks/tx_perception/gridmapping_nodelet/lib/libgridmapping.so: undefined symbol: _ZN2TX11GridProcess11updateGrid2ERKN5boost10shared_ptrIKN11sensor_msgs12PointCloud2_ISaIvEEEEE

Any help is greatly appreciated

EDIT 1

Alright the library issue is resolved, thanks to Tully! But now I am facing md5sum errors, I have checked all my packages for consistency in terms in messages(by rebuilding them after clean) and the node I am converting to nodelet runs just fine. Since I don't change message types during conversion, I was surprised to see this error in the log file after my nodelet crashed -

     [roscpp_internal] [2011-12-15 16:26:31,390] [thread 0x7f6100734760]: [DEBUG] UDPROS server listening on port ...