Pprobleme DATAFRAME

entities_df = pd.DataFrame(data["entities"])
var1 = entities_df.drop(['entities'], axis=1)
var2 = entities_df['entities'].apply(pd.Series)

entities_df = pd.concat([var1, var2], axis=1)

user_mentions_list = []
tableau_user_mentions = entities_df["user_mentions"]

for line in tableau_user_mentions:
   tableau = line
   for obj in tableau :
       user_mentions_list.append(obj)
       

screen_name = pd.DataFrame(user_mentions_list)
screen_name_t10 = screen_name.value_counts().head(10)
screen_name_t10.plot(kind='bar', color='red')

AttributeError                            Traceback (most recent call last)
<ipython-input-12-83950e8dd3c6> in <module>()
     15 
     16 screen_name = pd.DataFrame(user_mentions_list)
---> 17 screen_name_t10 = screen_name.value_counts().head(10)
     18 screen_name_t10.plot(kind='bar', color='red')

~\Anaconda3\lib\site-packages\pandas\core\generic.py in __getattr__(self, name)
   3079             if name in self._info_axis:
   3080                 return self[name]
-> 3081             return object.__getattribute__(self, name)
   3082 
   3083     def __setattr__(self, name, value):

AttributeError: 'DataFrame' object has no attribute 'value_counts'