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I was not setting the size of the points so i was getting problem here. To solve this problem i first allocated memory for the points also than it works fine.

trajectory_msgs::JointTrajectory joint_state;
std::vector<trajectory_msgs::JointTrajectoryPoint> points_n(3);
points_n[0].positions.resize(1);
points_n[0].velocities.resize(1);
...