[Nitro] Can't start app with nitro

[Les Pruszynski]

Hello,
I'm quite new to nitro and hopefully you'll be able to clarify a few  
things for me.
I tried to find out the answers for myself by so far not so good.

1. A new way to start nitro application is nitro command but  
unfortunately that does not work for me. I get the following error:
xxx:~/Projects/Ruby/nitro/examples/blog xxx$ nitro
app.rb:1:in `require': no such file to load -- facet/time/stamp  
(LoadError)
         from app.rb:1
Obviously the command cannot find a path to a file.
Do you also get the same error as I?

2 . When trying out a blog example from the examples folder I am  
unable to get to the admin part.
The documentation says that the command
require 'part/admin'
will create admin automatically, but it doesn't. Have I misunderstood  
the documentation?
In fact none of the examples with require 'part/admin' create the part.
Any help appreciated.
Many thanks,
Les