Getting FileAttribute error for files stored on my Mac

Question

I am trying to show a list of files from my computer using a server app that uses the IP address and you can look for a file from the phone.

I am fetching files successfully, but I have a problem with showing the size and creation date of files. This works fine on the iOS simulator!!! but on the real device, I am getting this error for each file:

FileAttribute error: Error Domain=NSCocoaErrorDomain Code=260 "The file “office-decor.jpg” couldn’t be opened because there is no such file." UserInfo={NSFilePath=/Users/username/Desktop/My%20office%20stuff/office-decor.jpg, NSUnderlyingError=0x281e279c0 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

I have created an URL extension to show date, size:

extension URL {
    var attributes: [FileAttributeKey : Any]? {
        do {
            return try FileManager.default.attributesOfItem(atPath: path)
        } catch let error as NSError {
            print("FileAttribute error: \(error)")
        }
        return nil
    }

    var fileSize: UInt64 {
        return attributes?[.size] as? UInt64 ?? UInt64(0)
    }

    var fileSizeString: String {
        return ByteCountFormatter.string(fromByteCount: Int64(fileSize), countStyle: .file)
    }

    var creationDate: Date? {
        return attributes?[.creationDate] as? Date
    }
}

my file path is something like this:

Users/username/Desktop/xxx.jpg

and trying to get the file path using URL like this to get the file size:

private var fileSize: String {
        guard let url = URL(string: path.addURLEncoding()) else { return "-" }
        return url.fileSizeString
    }

extension String {
    func addURLEncoding() -> String {
        return self.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
    }
}

I also tried file:// and URL(filePath...), URL(fileURLWithPath but still get that error on the device, which is working totally fine on simulator. Any idea how to fix that?