title: When loading data in Rstudio getting error "ReadItem: unknown type 161, perhaps written by later version of R"?
body: <p>When I am trying to load a clean data in Rstudio, file name called salesClean.RData, I am getting error.</p>
  
  <p>Error message is: <code>ReadItem: unknown type 161, perhaps written by later version of R</code></p>
  
  <p>Screenshot of error message:
  <img src="https://i.stack.imgur.com/2i39N.jpg" alt="screenshot"> </p>