title: JMeter error rate too high despite successful requests
body: <p>Update - Deleting the Aggregate report and rerunning the test now gives an error rate of 0. Why is this required?</p>
  
  <p>I am using JMeter 4.0 to hit a REST web service with 20 thread groups by sending a POST request with a JSON body. All 20 requests succeed and give proper response (200 with a correct JSON body). Why is the error rate above 99%? (See image below). Also, why is no of samples is 10063 in report even though View Results Tree tab shows 20 HTTP requests (each with error count 0). </p>
  
  <p><a href="https://i.stack.imgur.com/dkXG4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dkXG4.png" alt="enter image description here"></a></p>