Somewhere in your project, one of your units is looking for a file which is no longer there. Check the Uses clause of everything, there's two places where you can find the Uses, at the top, and just below the Implementation statement. Make sure there's nothing there in any of your units. That's the only reason Delphi would be complaining with this message, if there's a reference to a file which is no longer there. Double-click on this error message and see where it takes you.
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