Creating rqt plugin

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this is my package: https://github.com/azhar92/GUI-for-AV...

When I open rqt and try to open the plugin from the drop-down menu using the following steps

cd ~/catkin_ws
catkin_make
source ~/catkin_ws/devel/setup.bash
rqt --force-discover

I can see the name of my package when in the rqt gui, but when i click it,

I get the following error in the terminal output:

[ERROR] [1482121854.496133919]: Failed to load nodelet [rqt_test1/MyPlugin_1] of type [rqt_test1/MyPlugin]: MultiLibraryClassLoader: Could not create object of class type rqt_test1::MyPlugin as no factory exists for it. Make sure that the library exists and was explicitly loaded through MultiLibraryClassLoader::loadLibrary()
RosPluginlibPluginProvider::load_explicit_type(rqt_test1/MyPlugin) failed creating instance
PluginManager._load_plugin() could not load plugin "rqt_test1/MyPlugin": RosPluginlibPluginProvider.load() could not load plugin "rqt_test1/MyPlugin"

i think it has to do with the registration of the plugin. any form of guidance will be helpful. Thank you.

Plugin.xml : https://github.com/azhar92/GUI-for-AV...

Code:

<library path="lib/librqt_test1">

 <class name="rqt_test1/MyPlugin" type="rqt_test1::MyPlugin" base_class_type="rqt_gui_cpp::Plugin">

   <description>

4 buttons to switch between 4 different modes.

</description>

 <qtgui>

  <group>

   <label>Visualization</label>

    <statustip>Plugins related to visualization.</statustip>

  </group>

 <label>test1</label>

 <statustip>4 buttons to switch between 4 different modes.</statustip>

 </qtgui>

</class>

</library>