Oscurart_tools show 'Needs at least two selected objects' when distributing objects in blender 2.91


My configuration:

ubuntu 20.04 
python 3.8.5 
blender 2.91

Followed this:

Clone it:

git clone https://github.com/oscurart/Blender-28-Addons

And copy subfolder to addons:

sudo cp -r /home/alex/workspace/Thirdparty/Blender-28-Addons/oscurart_tools/ /usr/share/blender/2.91/scripts/addons

Then try to distribute 5 selected objects,but got error:

Needs at least two selected objects

and it seems this error occurred in old version.

Just an FYI, Oscurart Tools has been removed from Blender.