TransformPointCloud invalid argument error

void callback(const QuaternionStampedConstPtr& quaternionS, const PointCloudConstPtr& pointcloud)
{
	scan_in = pointcloud;
	angle_in = quaternionS;

	to_apply = TransformConstPtr(tf::Transform(angle_in.quaternion));

	pcl_ros::transformPointCloud(pointcloud,scan_out,*to_apply);

}


PointCloud scan_in;
PointCloud * scan_out;
QuaternionStamped angle_in;
TransformConstPtr to_apply;

This is my situation and the pcl_ros::transformPointCloud(pointcloud,scan_out,*to_apply); function give me invalid argument error. How can i solve it??