Preinstall error

Sudo ansible-playbook cloudbox.yml --tags preinstall -vvv
ansible-playbook 2.5.14
  config file = /root/cloudbox/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/a
nsible/plugins/modules']
  ansible python module location = /usr/local/lib/python2.7/dist-packages/ansible
  executable location = /usr/local/bin/ansible-playbook
  python version = 2.7.17 (default, Nov  7 2019, 10:07:09) [GCC 7.4.0]
Using /root/cloudbox/ansible.cfg as config file
Parsed /root/cloudbox/inventories/local inventory source with ini plugin
ERROR! Unexpected Exception, this is probably a bug: 'utf8' codec can't decode byte
0xf8 in position 0: invalid start byte
the full traceback was:

Traceback (most recent call last):
  File "/usr/local/bin/ansible-playbook", line 118, in <module>
    exit_code = cli.run()
  File "/usr/local/lib/python2.7/dist-packages/ansible/cli/playbook.py", line 122, i
n run
    results = pbex.run()
  File "/usr/local/lib/python2.7/dist-packages/ansible/executor/playbook_executor.py
", line 81, in run
    pb = Playbook.load(playbook_path, variable_manager=self._variable_manager, loade
r=self._loader)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/__init__.py", line 5
4, in load
    pb._load_playbook_data(file_name=file_name, variable_manager=variable_manager)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/__init__.py", line 1
06, in _load_playbook_data
    entry_obj = Play.load(entry, variable_manager=variable_manager, loader=self._loa
der)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/play.py", line 111,
in load
    return p.load_data(data, variable_manager=variable_manager, loader=loader)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/base.py", line 256,
in load_data
    self._attributes[target_name] = method(name, ds[name])
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/play.py", line 186,
in _load_roles
    role_includes = load_list_of_roles(ds, play=self, variable_manager=self._variabl
e_manager, loader=self._loader)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/helpers.py", line 36
5, in load_list_of_roles
    i = RoleInclude.load(role_def, play=play, current_role_path=current_role_path, v
ariable_manager=variable_manager, loader=loader)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/role/include.py", li
ne 59, in load
    return ri.load_data(data, variable_manager=variable_manager, loader=loader)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/base.py", line 243,
in load_data
    ds = self.preprocess_data(ds)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/role/definition.py",
 line 94, in preprocess_data
    role_name = self._load_role_name(ds)
  File "/usr/local/lib/python2.7/dist-packages/ansible/playbook/role/definition.py",
 line 131, in _load_role_name
    all_vars = self._variable_manager.get_vars(play=self._play)
  File "/usr/local/lib/python2.7/dist-packages/ansible/vars/manager.py", line 349, i
n get_vars
    data = preprocess_vars(self._loader.load_from_file(vars_file, unsafe=True))
  File "/usr/local/lib/python2.7/dist-packages/ansible/parsing/dataloader.py", line
90, in load_from_file
    file_data = to_text(b_file_data, errors='surrogate_or_strict')
  File "/usr/local/lib/python2.7/dist-packages/ansible/module_utils/_text.py", line
235, in to_text
    return obj.decode(encoding, errors)
  File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xf8 in position 0: invalid start
 byte