title: Netlogo - BehaviorSpace - reporter for measuring runs failed to report a result
body: <p>In my model, I have 3 producers and after each run, they each have 2 values for the profit and sale earned from their vehicle sold in the market. The model needs to run 100 times. I followed the steps for the behaviorspace tool, but I was uncertain what to add for the "Measure runs using reporters" section. I found this post <a href="https://stackoverflow.com/questions/34875056/netlogo-behaviorspace-measure-runs-using-reporters">enter link description here</a> . Following that, I used this </p>
  
  <p><code>[(list who profit)] of producers [(list who sale)] of producers</code> in order to see the number for "who" and the corresponding profit and sale. This has an error saying that <code>"reporter for measuring a run fails to report result - NULL"</code>. How can I resolve this issue? I should also mention that in the code there is no to-report without a return, but the returned things are not what I want to collect.</p>
  
  <p>Thanks</p>