安装allure后执行命令后报错 INTERNALERROR> AttributeError: module 'pytest' has no attribute 'allure'

C:\Users\Desktop\xin>pytest -s -q --alluredir report
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR> File "c:\python34\lib\site-packages\_pytest\main.py", line 199, in wrap_session
INTERNALERROR> config._do_configure()
INTERNALERROR> File "c:\python34\lib\site-packages\_pytest\config\__init__.py", line 636, in _do_configure
INTERNALERROR> self.hook.pytest_configure.call_historic(kwargs=dict(config=self))
INTERNALERROR> File "c:\python34\lib\site-packages\pluggy\hooks.py", line 306, in call_historic
INTERNALERROR> res = self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR> File "c:\python34\lib\site-packages\pluggy\manager.py", line 68, in _hookexec
INTERNALERROR> return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR> File "c:\python34\lib\site-packages\pluggy\manager.py", line 62, in <lambda>
INTERNALERROR> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
INTERNALERROR> File "c:\python34\lib\site-packages\pluggy\callers.py", line 208, in _multicall
INTERNALERROR> return outcome.get_result()
INTERNALERROR> File "c:\python34\lib\site-packages\pluggy\callers.py", line 80, in get_result
INTERNALERROR> raise ex[1].with_traceback(ex[2])
INTERNALERROR> File "c:\python34\lib\site-packages\pluggy\callers.py", line 187, in _multicall
INTERNALERROR> res = hook_impl.function(*args)
INTERNALERROR> File "c:\python34\lib\site-packages\allure\pytest_plugin.py", line 80, in pytest_configure
INTERNALERROR> pytest.allure._allurelistener = testlistener
INTERNALERROR> AttributeError: 'module' object has no attribute 'allure'