KeyError: Entries

[super-cache-money]

Firstly thanks for this amazing little utility.

When I run this command: sentrycli group 1079208708.json -o

I get this error:

Traceback (most recent call last):
  File "/my/path/Python/2.7/bin/sentrycli", line 9, in <module>
    load_entry_point('sentrycli==1.5.0', 'console_scripts', 'sentrycli')()
  File "/my/path/Python/2.7/lib/python/site-packages/sentrycli/main.py", line 17, in main
    argh.dispatch(parser)
  File "/Library/Python/2.7/site-packages/argh/dispatching.py", line 174, in dispatch
    for line in lines:
  File "/Library/Python/2.7/site-packages/argh/dispatching.py", line 277, in _execute_command
    for line in result:
  File "/Library/Python/2.7/site-packages/argh/dispatching.py", line 260, in _call
    result = function(*positional, **keywords)
  File "/my/path/Python/2.7/lib/python/site-packages/sentrycli/group.py", line 81, in group
    print_options(events)
  File "/my/path/Python/2.7/lib/python/site-packages/sentrycli/group.py", line 48, in print_options
    headers = get_keys('headers', events)
  File "/my/path/Python/2.7/lib/python/site-packages/sentrycli/group.py", line 32, in get_keys
    res = getattr(event, prop)
  File "/Library/Python/2.7/site-packages/cached_property.py", line 26, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/my/path/Python/2.7/lib/python/site-packages/sentrycli/event.py", line 30, in headers
    for entry in self:
  File "/my/path/Python/2.7/lib/python/site-packages/sentrycli/event.py", line 12, in __iter__
    return iter(self.raw['entries'])
KeyError: 'entries'