title: R error "can't combine <character> and <double>?
body: <p>I'm having an issue with a dataset that my team and I are working on. When trying to <code>mutate</code> a few variables into a new variable (named <code>EU</code>) here, this error pops up saying:</p>
  <pre><code>[Error: Problem with 'mutate()` input `EU`.
  x Can't combine `...` &lt;character&gt; and `..2` &lt;double&gt;.]
  </code></pre>
  <p>I should note that my team and I all get this issue, but not always in the same part of the script. We've all updated our software to match and it still seems to happen.</p>
  <p>Does anyone know how to fix this?? Thank you for any suggestions! We are learning as we go :)</p>