Need help to fix Error on Microsoft - Notepad application

Hi Friends,
Currently am learning UI automation topic and practicing on it. Whenever I try to open a Notepad and work on it with the classic activities and modern activities Use application/Open application as mentioned in the academy video. It throws me an error as attached. Kindly help me asap.
Please find the screenshot below.

Hi @Sri_Vennila
Is the notepad application opened during run time?

It is may be the selector issue.
Try to use *.txt* in the selector title.