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this->ocm.link_name = "ee_link";
this->ocm.header.frame_id = "base_link";
this->ocm.orientation = this->move_group.getCurrentPose().pose.orientation;

Are you sure getCurrentPose returns the pose in "base_link" and your current end-effector is "ee_link"? Try always to keep frame_ids and coordinates together and if you specify a hard-coded link name in one place, do the same for the rest of the code:

auto current_pose= this->move_group.getCurrentPose(this->ocm.link_name);
this->ocm.header.frame_id = current_pose.header.frame_id;
this->ocm.orientation = current_pose.pose.orientation;

It's hard to debug this further without more information on how you trigger the error.