It might be worth experimenting with other ways of doing the same? Maybe try launching IE using command line options instead (start process action) and then build an action that attaches to the running application once it is up and running.
Obviously that does not answer the problem about the error you are seeing, but it is often quicker to just move on to try other things.
One question for you! How come you are developing something new using Internet Explorer which is past it's end of life. I would recommend everything new you do in Blue Prism uses Chrome or Edge.