Hi Adi,
I apologize… I just did a test to see what will happen if I leave my Word document open when I run the automation, and it did not give me any errors. I also tried swapping the order of the applications around, but after several attempts I can’t reproduce the error.
So even though all I did was close the Word doc, I don’t think the open document is what caused the error for me - it must have been coincidental that the issue went away when I reran it…
BUT - I’m curious if you download and run the solution, if you would still receive the error. If you do get an error, then there’s more research to do, but if you don’t get the error, you can compare the actions in your project to the solution…