'ABCFile' object has no attribute 'instance'

[strano666]

I've tried to load three different swf, but all return the same error

warning: unknown tag 36
warning: unknown tag 36
warning: unknown tag 36
warning: unknown tag 36
warning: unknown tag 36
warning: unknown tag 36
warning: unknown tag 36
warning: unknown tag 21
warning: unknown tag 36
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/cmd2.py", line 2476, in onecmd_plus_hooks
    stop = self.onecmd(statement)
  File "/usr/local/lib/python2.7/site-packages/cmd2.py", line 2675, in onecmd
    stop = func(statement)
  File "flashmingo-cmd.py", line 58, in do_load
    self.swf = SWFObject(sample_file, ml=self.logger)
  File "<PATH>/flashmingo/flashmingo/SWFObject.py", line 73, in __init__
    self.instance_info = self.get_all_instances_info()
  File "<PATH>/flashmingo/flashmingo/SWFObject.py", line 132, in get_all_instances_info
    for ii in abc.instances:
AttributeError: 'ABCFile' object has no attribute 'instances'
EXCEPTION of type 'AttributeError' occurred with message: ''ABCFile' object has no attribute 'instances''

With the file under samples dir, i've no errors.