Build error when execute: catkin build 6DRepNet_ros

[Yaoxingtian]

Hi, thanks for your opensource work! It's really a good project.
The problem is, when I do catkin build 6DRepNet_ros,an error happend as below,
could you pls. help me:

[build] Error: Given package '6DRepNet_ros' is not in the workspace and pattern does not match any package