rqt plugin undefined symbol

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Hello ALL

I have this strange problem that I encountered while trying to write new plugin. I followed the rqt plugin tutorial and I am able to build. But when starting rqt I can see plugin in Visualization menu. When I click I get this message

[ERROR] [1427841427.537909362]: Failed to load nodelet [gps_plot/GPSPlot_1] of type [gps_plot/GPSPlot]: Failed to load library /home/rob/projects/Test/devel/lib//libgps_plot.so. Make sure that you are calling the PLUGINLIB_EXPORT_CLASS macro in the library code, and that names are consistent between this macro and your XML. Error string: Could not load library (Poco exception = /home/rob/projects/Test/devel/lib//libgps_plot.so: undefined symbol: _ZTVN8gps_plot9GPSPluginE)
RosPluginlibPluginProvider::load_explicit_type(gps_plot/GPSPlot) failed creating instance
PluginManager._load_plugin() could not load plugin "gps_plot/GPSPlot": RosPluginlibPluginProvider.load() could not load plugin "gps_plot/GPSPlot"

To get started I get one h and one cpp file. For now I commented out all Qt widget_ and ui_ to just build.

Also

ldd /home/rob/projects/Test/devel/lib//libgps_plot.so

does not show any missing libs

From above error I try to grep for strings

~/projects/Test/devel/lib$ strings libgps_plot.so  | grep _ZTVN8gps_plot9GPSPluginE
_ZTVN8gps_plot9GPSPluginE
_ZTVN8gps_plot9GPSPluginE

nm -u libgps_plot.so  | grep _ZTVN8gps_plot9GPSPluginE
U _ZTVN8gps_plot9GPSPluginE

So it is there

c++filt _ZTVN8gps_plot9GPSPluginE shows
vtable for gps_plot::GPSPlugin

I also made sure that I export class at bottom of cpp file

PLUGINLIB_EXPORT_CLASS(gps_plot::GPSPlugin, rqt_gui_cpp::Plugin)

So I am little puzzled by this. Any one knows or had this? I am thinking something is missing in my CMakeList file.

Also in above error there is double "//"before libgps_plot.so. Not sure how to fix this. I dod go over my plugin.xml and package.xml and CMakeLists.txt file over and over and I do not see anything odd.

load library /home/rob/projects/Test/devel/lib//libgps_plot.so

Here is my CMakeLists.txt

cmake_minimum_required(VERSION 2.8.3)

project(gps_plot)

find_package(catkin REQUIRED COMPONENTS
    dynamic_reconfigure
    message_generation
    roscpp
    rqt_gui
    rqt_gui_cpp
    sensor_msgs
    std_msgs
)

find_package(Boost REQUIRED COMPONENTS
    program_options
)

find_package(Qt4 REQUIRED COMPONENTS
    QtCore
    QtGui
)

include(${QT_USE_FILE})

set(gps_plot_SRCS
  src/gpsPlugin.cpp
)

set(gps_plot_HDRS
  include/gps_plot/gpsPlugin.h
)

catkin_package(
  INCLUDE_DIRS  ${gps_plot_INCLUDE_DIRECTORIES}
  LIBRARIES     ${PROJECT_NAME}
  CATKIN_DEPENDS dynamic_reconfigure message_generation roscpp rqt_gui rqt_gui_cpp sensor_msgs std_msgs
)

qt4_wrap_ui(
    gps_plot_UIS_H
    ${gps_plot_UIS}
)

include_directories(
    ${Boost_INCLUDE_DIRS}
)

link_directories(
    ${Boost_LIBRARY_DIRS}i
)

include_directories(
    include
    ${catkin_INCLUDE_DIRS}
)

add_library(
    ${PROJECT_NAME}
    ${gps_plot_SRCS}
)

target_link_libraries( 
   ${PROJECT_NAME}
   ${catkin_LIBRARIES}
   ${QT_QTCORE_LIBRARY}
   ${QT_QTGUI_LIBRARY}
   ${Boost_LIBRARIES}
)

find_package(class_loader)
class_loader_hide_library_symbols(${PROJECT_NAME})

install(FILES plugin.xml
  DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
)

install(TARGETS ${PROJECT_NAME}
    ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
    LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
    RUNTIME DESTINATION ${CATKIN_GLOBAL_BIN_DESTINATION}
)

install(DIRECTORY include/${PROJECT_NAME}/
    DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
)

And my plugin.xml

<library path="lib/libgps_plot">
  <class name="Btest/GPSPlot" type="gps_plot::GPSPlugin" base_class_type="rqt_gui_cpp::Plugin">
    <description>
      Test GPS plotter using nmea_msgs/Sentence and sensor_msgs/NavSatFix messages
    </description>
    <qtgui>
      <group>
        <label>Visualization</label>
        <icon type="theme">folder</icon>
        <statustip>Plugins related to visualization.</statustip>
      </group>
      <label>Test GPS plotter</label>
      <icon type="theme">applications-internet</icon>
      <statustip>Test GPS and status points on an map</statustip>
    </qtgui>
  </class>
</library>