When i login to Mac (upon turining on my mac) on the desktop there are popups file not found

So recently i have noticed (after updating to big sur), every-time i restart my mac or turn on my mac, i get these popups on my desktop: The file can't be found! - screenshot bellow.

This doesn't bother me that much, I just simply close the popup, but it bothers me, that there are files, that were enabled when logging in, that started, and i have no clue what files they are... Really just want to get to the bottom of this, and get rid of that pop ups for good.

Anyone have any experience, any hints, tips and trick, how can i locate these files, to disable them from being open upon startup?

Thank you.