'NoneType' object has no attribute 'startswith'

Hi guys

May I found help with this issue. It occurs when I try to install plugin throught playbook (dss_plugin).

Thanks in advance.

`The full traceback is:
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/ansible/executor/task_executor.py", line 144, in run
res = self._execute()
File "/usr/lib/python2.7/site-packages/ansible/executor/task_executor.py", line 648, in _execute
result = self._handler.run(task_vars=variables)
File "/usr/lib/python2.7/site-packages/ansible/plugins/action/normal.py", line 46, in run
result = merge_hash(result, self._execute_module(task_vars=task_vars, wrap_async=wrap_async))
File "/usr/lib/python2.7/site-packages/ansible/plugins/action/init.py", line 809, in _execute_module
(module_style, shebang, module_data, module_path) = self._configure_module(module_name=module_name, module_args=module_args, task_vars=task_vars)
File "/usr/lib/python2.7/site-packages/ansible/plugins/action/init.py", line 203, in _configure_module
environment=final_environment)
File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 1023, in modify_module
environment=environment)
File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 859, in _find_module_utils
recursive_finder(module_name, b_module_data, py_module_names, py_module_cache, zf)
File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 740, in recursive_finder
recursive_finder(py_module_file, py_module_cache[py_module_file][0], py_module_names, py_module_cache, zf)
File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 740, in recursive_finder
recursive_finder(py_module_file, py_module_cache[py_module_file][0], py_module_names, py_module_cache, zf)
File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 558, in recursive_finder
finder.visit(tree)
File "/usr/lib64/python2.7/ast.py", line 241, in visit
return visitor(node)
File "/usr/lib64/python2.7/ast.py", line 249, in generic_visit
self.visit(item)
File "/usr/lib64/python2.7/ast.py", line 241, in visit
return visitor(node)
File "/usr/lib/python2.7/site-packages/ansible/executor/module_common.py", line 460, in visit_ImportFrom
elif node.module.startswith('ansible.module_utils'):
AttributeError: 'NoneType' object has no attribute 'startswith'

fatal: [localhost]: FAILED! => {
"msg": "Unexpected failure during module execution.",
"stdout": ""
}`

まず、playbook を通じた dss_plugin のインストールを再現し、次に Ansible の module_common.py で recursive_finder と visit_ImportFrom の周辺を調べます。そこでは traceback が node.module.startswith に到達します。失敗しているプラグインの import と想定されるモジュール形式を比較します。完了条件は、playbook が NoneType traceback なしでプラグインをインストールできることです。