TileStache doesn't recognize "mapnik grid" provider

[Maciej Walczak]

Hi

I've installed TileStache, and I'm trying to generate some "utf grid" tiles. Unfortunely, TileStache throws "Unknown provider name: "mapnik grid"" when I'm trying to use "mapnik grid" as provider. Full error: http://pastebin.com/X5zUPzp9

My config: http://pastebin.com/HEppVEj6

Everything works fine if map provider is set to "mapnik" - server is starting up and I'm able to access tiles. If I change provider to "mapnik grid" - it throws an error.

I'm working on Ubuntu 14.04, and i've installed tilestache today, so it should be a fresh build. Any idea how to solve this?

Thanks in advance for any help :)

Maciek