Greetings.
I spent 4 hours with Apple support the past few days, and while I don't know if this is the right answer for all, it has to do with the login items for apps that maybe have been deleted but are still lingering on the system, particularly within LaunchAgents and LaunchDaemons. I learned that with Ventura, the login setup pages shows all apps that are firing up at startup. One can then slide on or off. With previous OS versions, its not so clear cut. I'll see if I can located the website again but...
Steps would be as follows.
1. Go to Finder
2. Go to "Go" in the menu
3. Drop down to "Go to folder" near the bottom.
4. Type in Launch. You should then see the two items LaunchAgents and LaunchDaemons. Look to see if you have old apps that you've deleted but still have remnants here. Consider deleting them.
5. I was then told to do the same thing again, but this time hold the option key, hit go again, drop down to "go to folder" and do the same search. Repeat. You can look at the source, and of course, don't delete anything that is an apple function. Otherwise you can blow things up within your system. You could just skip this system option and stick with #4 to see how it goes.
I probably had 20 apps still trying to run at startup. We deleted one at a time, rebooted, and kept doing it but eventually the "the file can't be found" disappeared.
What's strange, and I guess it's why Apple redesigned Ventura, is that the user would have no idea that these things are still hanging around. Nothing nefarious (though the screen viewing apps were the worst offenders), but still sketchy that they could have been used for bad things.
Good luck.