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It is totally ok to see the following error messages and you can safely ignore them.

Test the package by executing the below command from your workspace. Don't forget to source your workspace. $ roslaunch kinect2_bridge kinect2_bridge.launch

If you see the error message [ERROR] [DepthRegistrationOpenCL::init] Build Log: stringInput.cl:190:31: error: call to 'sqrt' is ambiguous.

To fix this, in kinect2_bridge.launch, update depth_method to opengl(Or the one works for you), and reg_method to cpu (reference: https://lubosz.wordpress.com/2016/03/29/viewing-kinect-v2-point-clouds-with-ros-in-archlinux/)