title: Not able to generate allure report in pytest. Getting 'AttributeError: module 'allure' has no attribute 'severity_level''
body: <p>I have 2 files-</p>
  
  <p>conftest.py:</p>
  
  <pre><code>import pytest
  from selenium import webdriver
  
  driver = None
  
  @pytest.fixture(autouse = True)
  def browserSetAndClose():
      global driver
  
      EXE_PATH = r'C:\Users\1602746\Softwares\chromedriver.exe'
      chromeOptions = webdriver.ChromeOptions()
      chromeOptions.add_experimental_option('useAutomationExtension', False)
      driver = webdriver.Chrome(executable_path = EXE_PATH, options = 
      chromeOptions, desired_capabilities = chromeOptions.to_capabilities())
      driver.implicitly_wait(10)
      driver.maximize_window()
      driver.get('http://the-internet.herokuapp.com/')
  
      yield driver
      driver.quit()
  </code></pre>
  
  <p>test_ABTesting.py:</p>
  
  <pre><code>import pytest
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support import expected_conditions
  from selenium.webdriver.support.wait import WebDriverWait
  
  import conftest
  
  @pytest.fixture
  def goToABTestingPage():
      wait = WebDriverWait(conftest.driver, 10)
      wait.until(expected_conditions.element_to_be_clickable((By.XPATH, "//a[starts-with(@href, '/abtest')]"))).click()
  
  
  def test_abTest_header(goToABTestingPage):
      a = conftest.driver.find_element_by_css_selector("h3").text
      assert 'A/B Test' in a
  
  def test_abTest_paragraph(goToABTestingPage):
      a = conftest.driver.find_element_by_xpath("//p[contains(text(),'Also known as split testing. This is a way in which businesses are able to simultaneously test and learn different versions of a page to see which text and/or functionality works best towards a desired outcome (e.g. a user action such as a click-through).')]").text
      assert 'Also known as split testing. This is a way in which businesses are able to simultaneously test and learn different versions of a page to see which text and/or functionality works best towards a desired outcome (e.g. a user action such as a click-through).' in a
  </code></pre>
  
  <p>I also have allure libraries added. Now I am running my 2 test cases by running the command:</p>
  
  <blockquote>
    <p>pytest test_ABTesting.py</p>
  </blockquote>
  
  <p>I keep getting this error:</p>
  
  <blockquote>
    <p>AttributeError: module 'allure' has no attribute 'severity_level'</p>
  </blockquote>
  
  <p>Not sure what it means.</p>