Error Target Class

I made an app in which I had one screen where the different vertical arrangements would be different functions/pages of the app
but I decided to make them separate screens, so I copied the screen & deleted other arrangements(pages) & kept the one I needed
in one particular screen, I have dynamic components & and a Firebase real-time database linked to get a list of items & display, a map component & other basic component. now this is the error i get when i initial the screen :
and screen items do not initialise