How to solve "Extra trailing closure passed in call" in a section?

Welcome to the forum.

Hard to say with the code you show.

Please post complete code of the View. The error may be elsewhere, like a missing or misplaced closing curly brace. Maybe there's a false note in the music. 😉

Hellooo, thanks so much for the help you are so nice 🫶 This is the complete code from the view section:

import SwiftUI
import SwiftData
import UniformTypeIdentifiers

struct AddRepertoireView: View {
    @Environment(\.modelContext) private var modelContext
    @Environment(\.dismiss) private var dismiss
    
    @State private var title = ""
    @State private var composer = ""
    @State private var opus = ""
    @State private var epoch = ""
    @State private var type = ""
    @State private var accompaniment = ""
    @State private var length: Int?
    @State private var key = ""
    @State private var difficulty = ""
    @State private var tempo: Int?
    @State private var showingFilePicker = false
    @State private var sheetMusicData: Data?
    @State private var sheetMusicFileName: String?
    
    var body: some View {
        Form {
            Section("Essential Information") {
                TextField("Title", text: $title)
                TextField("Composer", text: $composer)
                TextField("Opus", text: $opus)
            }
            
            Section("Additional Details") {
                TextField("Epoch", text: $epoch)
                TextField("Type", text: $type)
                TextField("Accompaniment", text: $accompaniment)
                TextField("Length (minutes)", value: $length, format: .number)
                    .keyboardType(.numberPad)
                TextField("Key", text: $key)
                TextField("Difficulty", text: $difficulty)
                TextField("Tempo (BPM)", value: $tempo, format: .number)
                    .keyboardType(.numberPad)
            }
            
            Section("Sheet Music") {
                if let fileName = sheetMusicFileName {
                    HStack {
                        Text(fileName)
                            .foregroundStyle(.secondary)
                        
                        Spacer()
                        
                        Button(role: .destructive) {
                            sheetMusicData = nil
                            sheetMusicFileName = nil
                        } label: {
                            Label("Remove", systemImage: "trash")
                        }
                    }
                }
                
                Button {
                    showingFilePicker = true
                } label: {
                    Label(sheetMusicData == nil ? "Add Sheet Music" : "Replace Sheet Music",
                          systemImage: sheetMusicData == nil ? "plus.circle" : "arrow.triangle.2.circlepath")
                }
            }
        }
        .navigationTitle("Add Piece")
        .toolbar {
            ToolbarItem(placement: .confirmationAction) {
                Button("Add") {
                    addEntry()
                }
                .disabled(title.isEmpty || composer.isEmpty)
            }
        }
        .fileImporter(
            isPresented: $showingFilePicker,
            allowedContentTypes: [UTType.pdf],
            allowsMultipleSelection: false
        ) { result in
            switch result {
            case .success(let urls):
                guard let originalURL = urls.first else { return }
                
                let tempURL = FileManager.default.temporaryDirectory
                    .appendingPathComponent(UUID().uuidString)
                    .appendingPathExtension("pdf")
                
                do {
                    if originalURL.startAccessingSecurityScopedResource() {
                        defer { originalURL.stopAccessingSecurityScopedResource() }
                        
                        try FileManager.default.copyItem(at: originalURL, to: tempURL)
                        let data = try Data(contentsOf: tempURL)
                        sheetMusicData = data
                        sheetMusicFileName = originalURL.lastPathComponent
                        
                        try? FileManager.default.removeItem(at: tempURL)
                    }
                } catch {
                    print("Error loading PDF: \(error.localizedDescription)")
                }
                
            case .failure(let error):
                print("Error selecting PDF: \(error.localizedDescription)")
            }
        }
    }
    
    private func addEntry() {
        let entry = RepertoireEntry(
            title: title,
            composer: composer,
            opus: opus.isEmpty ? nil : opus,
            epoch: epoch.isEmpty ? nil : epoch,
            type: type.isEmpty ? nil : type,
            accompaniment: accompaniment.isEmpty ? nil : accompaniment,
            length: length,
            key: key.isEmpty ? nil : key,
            difficulty: difficulty.isEmpty ? nil : difficulty,
            tempo: tempo
        )
        
        entry.sheetMusicData = sheetMusicData
        entry.sheetMusicFileName = sheetMusicFileName
        
        modelContext.insert(entry)
        dismiss()
    }
}

#Preview {
    let config = ModelConfiguration(isStoredInMemoryOnly: true)
    let container = try! ModelContainer(for: RepertoireEntry.self, configurations: config)
    
    return NavigationStack {
        AddRepertoireView()
    }
    .modelContainer(container)
}

Yeah I'm, currently developing "The fitness tracker for practicing your instrument", but I'm having some issues trying to learn swift. But thanks for taking a look at it 😊