Error When trying to BIND bones.
Tried this with Blender 2.8 and 3.0
I am binding an imported skeleton with mocap animation on it (Source)
to a Library Override Character Contro Rig (Target)
I set up the nodes, assign them each to the correct Target and Source slots
I can create the Bone Node from Selected Nodes.
When I press BIND I get this Error:

If there is no support for working with Library overrides it would be a great feature to add. My whole pipeline is built to animate with Library override rigs so that I can update improve the one rig and automatically see it updated in various animation scenes.
unfortunately Blender not support edit mode on Library override object, that is why the error say Unable to execute 'Toggle Edit Mode', error changing modes
https://blenderartists.org/t/will-blenders-library-override-eventually-support-edit-mode-and-sculpt-mode-to-create-shape-keys/1307618/24
this is current Blender limitation, for workflow you can import/append rig and then retarget and bake the action on another blend file and then import the action