Error during rake update

[sgerrand]

When running the post install rake task "rake development radiant:extensions:tiny_paper:update", I had he following error returned:

Could not load extension from file: tiny-paper_extension.

<NameError: wrong constant name Tiny-paperExtension>

Copying assets from TinyPaperExtension
rake aborted!
You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.+