error, metadata only contains stopwords

getting this error

`Traceback (most recent call last):
  File "main.py", line 366, in currentMediaChangedHandler
    recommendModel = self.manageCache.queryCache(self.currentPlayingMediaUrl, self.manageLocalStorage)
  File "C:\Users\riflerRick\Desktop\NiitUniversityCSE_course\3rdyr\semester5\softwareEngineering\project\gitRepos\Recommend\recommend\classifier\ManageCacheModule.py", line 177, in queryCache
    recommendedSongsPathList = getRecom.predict(SPath, relevantSongDict)
  File "C:\Users\riflerRick\Desktop\NiitUniversityCSE_course\3rdyr\semester5\softwareEngineering\project\gitRepos\Recommend\recommend\classifier\GetRecommendationModule.py", line 143, in predict
    clusters.find_clusters(4)
  File "C:\Users\riflerRick\Desktop\NiitUniversityCSE_course\3rdyr\semester5\softwareEngineering\project\gitRepos\Recommend\recommend\classifier\cluster\algorithms\KMeans.py", line 54, in find_clusters
    tfidf_matrix = tfidf_vectorizer.fit_transform(self.snippets) #fit the vectorizer to synopses
  File "C:\Users\riflerRick\Anaconda3\lib\site-packages\sklearn\feature_extraction\text.py", line 1305, in fit_transform
    X = super(TfidfVectorizer, self).fit_transform(raw_documents)
  File "C:\Users\riflerRick\Anaconda3\lib\site-packages\sklearn\feature_extraction\text.py", line 817, in fit_transform
    self.fixed_vocabulary_)
  File "C:\Users\riflerRick\Anaconda3\lib\site-packages\sklearn\feature_extraction\text.py", line 764, in _count_vocab
    raise ValueError("empty vocabulary; perhaps the documents only"
ValueError: empty vocabulary; perhaps the documents only contain stop words`