Example does not work

[bizso09]

from beaker.cache import cache_regions, cache_region

# configure regions
cache_regions.update({
   'short_term':{
       'expire':'60',
       'type':'memory'
   }
})

@cache_region('short_term')
def load():
    '''Load from a database given a search term, limit, offset.'''
    return []

a = load()

------------------------------
  a = load()
File "C:\Python27\lib\site-packages\beaker\cache.py", line 563, in cached
  key_length = cache_regions[region]['key_length']
KeyError: 'key_length'