Not able to find the element on the screen error

While running a bot individually, it is able to find all the elements on the screen but when the same bot is being run with other bots from a single executable file, it got stuck on a particular element (opening the excel sheet button available on the screen) by saying that it is not able to find an element on the screen every time.

Could you please help me why it is specifically happening only in case of multiple files being run in one executable file.