dyn_recfg c++: compiling but no items in rqt_reconfigure

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HI, I try to get the dynamic reconfigure to run in c++. My Project is compiling without problems, but the variables do not appear in rqt? I have a class based structure like following:

//Class Instance: class_instance.h

#include "ros/ros.h"
#include "project_name/ManipulatorConfig.h"
#include <dynamic_reconfigure/server.h>
#include <boost/bind.hpp>

class ClassInstance{
    void ClassInstance::subReconfigureCallback(project_name::ProjectConfig &config, uint32_t level) {
      ROS_INFO("Reconfigure Request: %f", config.joint1_angle);
      ROS_INFO("Reconfigure Request: %f", config.joint2_angle);
      ROS_INFO("Reconfigure Request: %f", config.joint3_angle);
   }
   ClassInstance(){
     dynamic_reconfigure::Server<project_name::ProjectConfig> server;
     dynamic_reconfigure::Server<project_name::ProjectConfig>::CallbackType f;
     f = boost::bind(&ClassInstance::subReconfigureCallback, this, _1, _2);
     server.setCallback(f);
   }
}

//Main: main.cpp

#include "ros/ros.h"
#include "class_instance.h" 
int main(int argc, char **argv){
    ros::init(argc, argv, "project_name_node");
    ClassInstance class_instance;
    ros::spin();    
    return 0; 
}

//ProjectConfig.cfg

#!/usr/bin/env python
PACKAGE = "project_name"
from dynamic_reconfigure.parameter_generator_catkin import *
gen = ParameterGenerator()
gen.add("var1", double_t, 0, "A double parameter",    0, 0.0,  2.0)
gen.add("var2", double_t, 0, "A double parameter",    0, 0.0,  2.0)
gen.add("var3", double_t, 0, "A double parameter",    0, 0.0,  2.0)
exit(gen.generate(PACKAGE, "project_name", "Project"))

The CMAKELISTS and PACKAGE are created according to the dynamix reconfigure tutorial. Do you have any idea? Thanks a lot!