Type ‘…’ does not conform to protocol ‘ViewModifier’

0
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Can’t figure out why I’m getting this error. I’ve seen similar questions on the internet, but basically all the examples deal with images, what am I doing wrong?

my code:

struct OffsetModifier: ViewModifier {
    
    @Binding var offset: CGFloat
    var returnFromStart: Bool = true
    @State var startValue: CGFloat = 0
    
    func body(content: Content) -> some View {
        content
            .overlay {
                GeometryReader { proxy in
                    Color.clear
                        .preference(key: OffsetKey.self, value: proxy.frame(in: .named("SCROLL")).midY)
                        .onPreferenceChange(OffsetKey.self) { value in
                            
                            if startValue == 0 {
                                startValue = value
                            }
                            
                            offset = (value - (returnFromStart ? startValue : 0))
                        }
                }
            }
    }
}

struct OffsetKey: PreferenceKey {
    static var defaultValue: CGFloat = 0
    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
        value = nextValue()
    }
}

here

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