Why do I get a 'Failed to set value' error when trying to add a 'Copy Location' constraint to my rig? I'm trying add a Copy Location constraint but it doesn't work. I am making a metarig like in the video but if I press enter its cast nothing happens.
I tried picker thing I get this error:


Blend file link: https://dosya.co/9qudtsa52r77/1.blend.html
If you want to use this constraint between bones, try to use bone constraint in pose mode.