Can't convert OcTree to Fcl

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Hello everyone,

I'm trying to create a code for 2D collision checking using fcl and octomap.

Here i'm trying to convert the octomap::octree to fcl::octree so that i can use the function: "generateBoxesFromOctomap".

I am following this program as a guide: link

I'm using ROS kinetic on Ubuntu 16.04, fcl is version 0.6.

This is my code:

   OcTree* octTree = new OcTree(0.1);
   Pointcloud octPointCloud;

   for (int x=-20; x<20; x++) {
   for (int y=-20; y<20; y++) {
   point3d endpoint ((float) x*0.05f, (float) y*0.05f, (float) 0.0);
   if (endpoint.x() < 0.7 && endpoint.x() > 0.3 && endpoint.y()< 0.6 && endpoint.y() > 0.8)          //size of the obstacle
   octPointCloud.push_back(endpoint); 
      } 
    }
  point3d origin(0.0,0.0,0.0);
  octTree->insertPointCloud(octPointCloud,origin);
  octTree->updateInnerOccupancy();     

  //convert the octomap 
  fcl::OcTree<double>* tree2 = new fcl::OcTree(boost::shared_ptr<const octomap::OcTree>(octTree));
  std::vector<fcl::CollisionObject<double>*> boxes;
  generateBoxesFromOctomap(boxes, *tree2);

but i get this error:

error: expected type-specifier
  fcl::OcTree<double>* tree2 = new fcl::OcTree(boost::shared_ptr<const octomap::OcTree>(octTree))

What can i do?