You copied to a non-trusted location hence the yellow bar. I only copy to trusted location so I can't tell you if it's trusted now by saying OK once. You can check in the db properties - look for Trusted Locations and compare the path to your db and see if it is one now.
Converting code will not fix the error. Something is looking for that field or control name and it can't be found. Could be a spelling mistake, could be that it was never there and earlier version didn't choke on it. I see a lot of such sudden errors when switching OS or Office versions - they tend to be less forgiving. You will have to look to find the missing item. Could be on a form that's opening, could be misspelled in the macro, could be in a query that some form is bound to, could be in code, could be in a control expression (e.g. txtMyTextbox has an expression like = NameOfMissingControl.
If you remain stuck, you could copy your db, compact it, zip and post it here. Most of us don't use macros beyond maybe AutoExec so anything you post about that might not help a whole lot.
Last edited by Micron; 12-12-2020 at 03:15 PM.
Reason: added info
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.