Boost error: ‘f’ cannot be used as a function

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I encountered a really strange error. I am writing a really simple code. Mostly still empty and just learning how to write node in C++. My code consist of 3 files.

RoverMove.cpp

#include "rover_move/rover_move.h"

int main(int argc, char** argv) {
   ros::init(argc, argv, "RoverMove");
   ros::NodeHandle n;
   ros::Subscriber goal_sub;
   ros::Publisher vel_pub;

   goal_sub = n.subscribe<geometry_msgs::Twist>("goal", 1, "goal_call_back");
   vel_pub = n.advertise<geometry_msgs::Twist>("cmd_vel", 1);
   ros::spin();
   return 0;
}

rover_move.h

#include "ros/ros.h"
#include"geometry_msgs/Twist.h"

#ifndef ROVER_MOVE_H
#define ROVER_MOVE_H


void goal_call_back(geometry_msgs::Twist goal);


#endif /* ROVER_MOVE_H */

RoverMoveLib.cpp

#include "rover_move/rover_move.h"

void goal_call_back(geometry_msgs::Twist goal){
// still empty 
}

I have input necessary config in CMake file and I got this error:

Can anyone help me why this happened? I just want to try a simple code. Publishing and subscribng to Twist type message.