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As the error states, you haven't declared move_group or my_plan. You do already have a MoveGroupInterface but you called it group (i.e., not move_group). Just change the names to match.

As for the missing my_plan, you can put a line before the move_group.plan(my_plan) call like the following: moveit::planning_interface::MoveGroupInterface::Plan my_plan;

You already probably found it but you can reference the tutorial here. The full tutorial code for the MoveGroupInterface can be found here.

Good luck!