wrapper is not defined?

Hey, I am trying to write a custom library for the Bittle but I can't seem to run example.py file. In the documentation there is a reference to stepup.py aswell which seems to be missing from the library?

When I run the example program I get some thing like this:

['kbalance', 1]

Traceback (most recent call last):

File "example.py", line 222, in <module>

wrapper(task)

NameError: name 'wrapper' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "example.py", line 230, in <module>

wrapper(['d',1])

NameError: name 'wrapper' is not defined

I am runnning an Ubuntu machine, can you help me with this?