title: R mutate ( ".data" is missing, with no default)
body: <p>I wrote this function in R </p>
  
  <pre><code>match &lt;- followers %&gt;%
    +   mutate(x= ifelse(followers$screen_name %in% xnames$screen_name, 1, 0),y= ifelse(followers$screen_name %in% ynames$screen_name,   1, 0))            
  </code></pre>
  
  <p>but i get this error and i can't solve it </p>
  
  <pre><code>Error in mutate_(.data, .dots = compat_as_lazy_dots(...)) : 
    argument ".data" is missing, with no default
  </code></pre>
  
  <p>here more information about the data</p>
  
  <pre><code>  &gt; str(xnames)
      'data.frame':   5000 obs. of  1 variable:
       $ screen_name: chr  "27khT5dIkDpu4hl" "M8ibrahem" "IBRAHEM87711" "ryooon85" ...
      &gt; str(ynames)
      'data.frame':   5000 obs. of  1 variable:
       $ screen_name: chr  "rosebiose" "S7q0QTdIk8SLcNm" "DleGQquoaUGxQzn" "RxafjLONGO6UgS8" ...
  str(followers)
  'data.frame':   9925 obs. of  1 variable:
   $ screen_name: chr  "27khT5dIkDpu4hl" "M8ibrahem" "IBRAHEM87711" "ryooon85" ...
  </code></pre>
  
  <p>here is sample of the data </p>
  
  <pre><code>    &gt; head(xnames)
            screen_name
      1 27khT5dIkDpu4hl
      2       M8ibrahem
      3    IBRAHEM87711
      4        ryooon85
      5        sqrr1233
      6          3ram16
  
  &gt; head(ynames)
        screen_name
  1       rosebiose
  2 S7q0QTdIk8SLcNm
  3 DleGQquoaUGxQzn
  4 RxafjLONGO6UgS8
  5 YlirzqF0N9EfeOY
  6      AL_3GEEEED
  
  &gt; head(followers)
        screen_name
  1 27khT5dIkDpu4hl
  2       M8ibrahem
  3    IBRAHEM87711
  4        ryooon85
  5        sqrr1233
  6          3ram16
  </code></pre>
  
  <p>I tried also to convert the type of the columns to factor but still gives me the same error</p>
  
  <p>thank you </p>