Can't create MoveGroupInterface object in my own class

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Hi, I have a project requirement where I want object of moveit::planning_interface::MoveGroupInterface class inside my own class as a class member. But I couldn't' as it gives the following error. I tried some digging but can't figure it out myself. I tried inheritance but it doesn't work and makes things too much complicated. Please help to create a working object of MoveGroupInterface class inside my own class ROS1.Kinetic - Ubuntu 16.04LTS , c++11 Errors:

1. expected identifier before string constant moveit::planning_interface::MoveGroupInterface move_group("arm_torso");

2. ‘move_group’ does not name a type move_group.setPoseReferenceFrame("base_footprint");

   #include <moveit/move_group_interface/move_group_interface.h>
   
   class Move_operations_class 
   {
       public:
       int a,b;
   
       moveit::planning_interface::MoveGroupInterface move_group("arm_torso");
   
       //The following format works below but doesn't let me use any MoveGroupInterface class fucntions
       //moveit::planning_interface::MoveGroupInterface move_group(const std::string name="arm_torso");
       //This does'nt work in any case
       //movegroup.setPoseReferenceFrame("base_footprint");
   
       //Constructor
       Move_operations_class(const std::string &move_group_name) 
               {
                   //The below line works but the variable gets deleted after constructor call
                   moveit::planning_interface::MoveGroupInterface  move_group(name);
   
           }
   
   };
   
   int main(int argc, char** argv)
   {
       ros::init(argc, argv, "move_operations");
       ROS_INFO("Starting application ...");
       ros::NodeHandle nh;
       ros::AsyncSpinner spinner(1);
       spinner.start();
   
       //This line works fine though
       moveit::planning_interface::MoveGroupInterface move_group_main("arm_torso");
       Move_operations_class move_op("arm_torso");
       return 0;
   }