an error occured while launched node 'dope'

[Hsuweehou]

Traceback (most recent call last):
File "/home/mellot/ob_robot_arm/src/DOPE-ROS-D435/dope/nodes/dope", line 24, in
from inference.cuboid_pnp_solver import CuboidPNPSolver
File "/home/mellot/ob_robot_arm/src/DOPE-ROS-D435/dope/nodes/inference/cuboid_pnp_solver.py", line 8, in
from pyrr import Quaternion
ImportError: No module named pyrr