WebHttpHtml - "an error has occurred"

Hello,

I am using windows Server 2012 R2. I have developed a script in WebHttpHtml, version 12.53. When I replay the script it run without any error.

I closed the script, again open the script in Generator, and click on replay, one error message pop-up “An error has occurred.” (please check the attachment)

How to solve it?

Thanks