failures not handled while exception raised

The issue occurs because the failures object isnt handled when its length is more than 1
in taskflow/types/failure.py

        if len(failures) == 1:
            failures[0].reraise()
        elif len(failures) > 1:
            raise exc.WrappedFailure(failures)
============================================================================================

Traceback (most recent call last):
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/taskflow/engines/action_engine/executor.py", line 53, in _execute_task
        result = task.execute(**arguments)
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/pypowervm/utils/transaction.py", line 478, in execute
        self._wrapper = _execute(self._wrapper or self._getter)
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/pypowervm/utils/transaction.py", line 99, in _synchronize
        @lock.synchronized(wrp_or_spec.uuid)
    Traceback (most recent call last):
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/pypowervm/utils/transaction.py", line 785, in execute
        executor=ContextThreadPoolExecutor(self.max_workers)))
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/taskflow/engines/helpers.py", line 162, in run
        engine.run()
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/taskflow/engines/action_engine/engine.py", line 247, in run
        for _state in self.run_iter(timeout=timeout):
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/taskflow/engines/action_engine/engine.py", line 340, in run_iter
        failure.Failure.reraise_if_any(er_failures)
      File "/root/esca/nova-powervm/.tox/py27/local/lib/python2.7/site-packages/taskflow/types/failure.py", line 342, in reraise_if_any
        raise exc.WrappedFailure(failures)
    WrappedFailure: WrappedFailure: [Failure: AttributeError: 'str' object has no attribute 'uuid', Failure: AttributeError: 'str' object has no attribute 'uuid']