$ flexget seen add http://imdb.com/title/tt3691740/
Traceback (most recent call last):
File "/tmp/bin/flexget", line 9, in <module>
    load_entry_point('FlexGet', 'console_scripts', 'flexget')()
File "/tmp/flexget/flexget/__init__.py", line 42, in main
    manager.start()
File "/tmp/flexget/flexget/manager.py", line 326, in start
    self.handle_cli()
File "/tmp/flexget/flexget/manager.py", line 353, in handle_cli
    options.cli_command_callback(self, command_options)
File "/tmp/flexget/flexget/plugins/cli/seen.py", line 16, in do_cli
    seen_add(options)
File "/tmp/flexget/flexget/plugins/cli/seen.py", line 39, in seen_add
    seen.add(seen_name, 'cli_add', {'cli_add': seen_name})
AttributeError: 'module' object has no attribute 'add'