title: ggplot2 fails to load, with 'rlang' package error
body: <p>This is the error message:</p>
  
  <blockquote>
    <p>Error: package or namespace load failed for ‘ggplot2’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]):
     namespace ‘rlang’ 0.3.4 is already loaded, but >= 0.4.0 is required</p>
  </blockquote>
  
  <p>In addition to a Warning message:</p>
  
  <blockquote>
    <p>package ‘ggplot2’ was built under R version 3.6.1 </p>
  </blockquote>
  
  <p>Please help. Thanks a lot.</p>