title: SummarySE() function throwing error: Can't rename columns that don't exist. x The column `len` doesn't exist
body: <p>My R version is 3.6.0. I'm trying to use the summarySE() defined here for creating error bars: <a href="http://www.cookbook-r.com/Graphs/Plotting_means_and_error_bars_(ggplot2)/" rel="nofollow noreferrer">http://www.cookbook-r.com/Graphs/Plotting_means_and_error_bars_(ggplot2)/</a></p>
  
  <p>I have used this function many times to plot error bars before. However, when I tried to run the function after updating R I get the following error. </p>
  
  <pre><code> Error: Can't rename columns that don't exist.
  x The column `value` doesn't exist.
  </code></pre>
  
  <p>I tried running the sample code on the website (see below) and I get the same error.</p>
  
  <pre><code>tg &lt;- ToothGrowth
  head(tg)
  tgc &lt;- summarySE(tg, measurevar="len", groupvars=c("supp","dose"))
  head(tgc)
  </code></pre>
  
  <p>However, when I tried to run the code on an online compiler with R version 3.3.2 it worked. So frustrating!!</p>