title: Jmeter Error: Couldn't save test paln to file
body: <p>I am getting below error message when going to save my test plan.</p>
  
  <p>I added regular expression extractor and the listeners
  <a href="https://i.stack.imgur.com/9uRqJ.png" rel="nofollow noreferrer">Error image</a>. 
  I am not allowing to save my test plan now.</p>