Open Panda3d Level Editor

A few minutes ago, I found out, that there is a LevelEditor for Panda3d 8)
I found the direct/leveleditor category in the Panda3D folder. Now I dont know how how to execute the LevelEditor :question:
There are various .py files but every time I want to execute them with python an Error occurs:

How can I execute the Level Editor successfully?

Hi! Afaik the level editor is not actively maintained (as you can see by the commit time of its files). Imho it makes sense since Blender can be used for producing levels for Panda3D games. Moreover, there are great projects like BlenderPanda.