NLP NLTK stopwords

from nltk.corpus import stopwords
stoplist = stopwords.words('english')
text = "this is just a test"
cleanwordlist = [word for word in text.lower().split() if word not in stoplist]
cleanwordlist

LookupError: 
**********************************************************************
  Resource stopwords not found.
  Please use the NLTK Downloader to obtain the resource:
   import nltk
  >>> nltk.download('stopwords')
 没有那就下