title: Error: 'set_envvar' is not an exported object from 'namespace:xfun'
body: <p>I'm trying to run Data Exploration in my R Studio, version 1.3.959 on my windows10.I wrote following test code</p>
  <pre><code>if (!require(devtools)) install.packages(&quot;devtools&quot;)
  devtools::install_github(&quot;boxuancui/DataExplorer&quot;, ref = &quot;develop&quot;)
  library(DataExplorer)
  diabetes_data &lt;- read.csv(&quot;https://raw.githubusercontent.com/jbrownlee/Datasets/master/pima-indians-diabetes.csv&quot;, header = FALSE)
  names(diabetes_data) &lt;- c(&quot;number_of_times_pregnant&quot;, &quot;plasma_glucose_conc&quot;, &quot;diastolic_bp&quot;, &quot;triceps_skinfold_thickness&quot;, &quot;two_hr_serum_insulin&quot;, &quot;bmi&quot;, &quot;diabetes_pedigree_function&quot;, &quot;age&quot;, &quot;label&quot;)
  # create report
  create_report(diabetes_data)
  </code></pre>
  <p>But I'm getting error message</p>
  <pre><code>Error: 'set_envvar' is not an exported object from 'namespace:xfun'
  </code></pre>
  <p>Can you please help me to resolve the issue?</p>