Saving particle locations at end of run

I have updated mfix to 20.4.3, and want to save the particle locations at the end of my run. I’ve loaded my model and checked the respective box on the output pane, but I get the following error come up when I press run. Can anybody help me with this?

Are you using the 20.4.3 default solver? If you have a custom solver (based on 20.3 release or prior) in your project directory, make sure you build again so the new keyword is recognized.

I am just using the mfix default solver

I cannot reproduce with the 20.4.3 default solver. The only way I can trigger the error is if I select another solver (prior to 20.4 release).

I thought I was using the default solver but I actually wasn’t. I have corrected this now, thankyou.