The issue:
Import an older asset to Maya 2016.5, save the scene. Open it.
This error message pops up:
“Errors have occurred while reading this scene that may result in data loss.
Please check the Script Editor for details.”

Solution:

• Turn off the DAG Objects Only option in Outliner.
• Delete the unnecessary defaultRenderLayer nodes, with names like this: *_defaultRenderLayer. (You need only one default 🙂 )
• Save.

That’s all.

Cheers, D