Boundary Estimation Error.

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I am trying to extract boundary points from point cloud,and want to print the boundary points.Unfortunately, I got error like error C2248: 'pcl::BoundaryEstimation<pointint,pointnt,pointoutt>::computeFeature' : cannot access protected member declared in class 'pcl::BoundaryEstimation<pointint,pointnt,pointoutt>'. Did anybody experience this? Thanx in advance.

Here is my sample code.

int main (..) 
{ 
//Load point cloud 

pcl::PointCloud<pcl::Normal>::Ptr normals (new pcl::PointCloud<pcl::Normal>); 
pcl::NormalEstimation<pcl::PointXYZ, pcl::Normal> ne; 
ne.setInputCloud (cloud.makeShared()); 
pcl::search::KdTree<pcl::PointXYZ>::Ptr tree (new pcl::search::KdTree<pcl::PointXYZ> ()); 
ne.setSearchMethod (tree); 
ne.setRadiusSearch (0.03); 
ne.compute (*normals); 

pcl::PointCloud<pcl::Boundary> boundaries; 
pcl::BoundaryEstimation<pcl::PointXYZ, pcl::Normal, pcl::Boundary> est; 
est.setInputCloud (cloud.makeShared()); 
est.setInputNormals (normals); 
est.setRadiusSearch (0.03); 
est.setSearchMethod (pcl::search::KdTree<pcl::PointXYZ>::Ptr (new pcl::search::KdTree<pcl::PointXYZ>)); 
est.compute (boundaries); 

pcl::PointCloud<pcl::Boundary>::Ptr boundary_cloud (new pcl::PointCloud<pcl::Boundary> ()); 
est.computeFeature(*boundary_cloud); /// Error Here 

cout<<"Boundary Size:"<<boundaries.points.size()<<endl; 
}