AVAssetExportSession issue with AVAssetExportPreset type

I am using this extension to save video file from AVAsset to the tmp folder. Problem is that when I am using AVAssetExportPresetHighestQuality type video files could not be saved due to that reason:

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSUnderlyingError=0x1748482e0 {Error Domain=NSOSStatusErrorDomain Code=-12780 "(null)"}, NSLocalizedFailureReason=An unknown error occurred (-12780), NSLocalizedDescription=The operation could not be completed}

Also some times even when I am using AVAssetExportPresetHighestQuality it saves video but in random order.

extension AVAsset {

    func write(to url: URL, success: @escaping () -> (), failure: @escaping (Error) -> ()) {
        guard let exportSession = AVAssetExportSession(asset: self, presetName: AVAssetExportPresetMediumQuality) else {
            let error = NSError(domain: "domain", code: 0, userInfo: nil)
            failure(error)

            return
        }

        exportSession.outputFileType = AVFileTypeMPEG4
        exportSession.outputURL = url

        exportSession.exportAsynchronously {
            switch exportSession.status {
            case .completed:
                success()
            case .unknown, .waiting, .exporting, .failed, .cancelled:
                let error = NSError(domain: "domain", code: 0, userInfo: nil)
                failure(error)
            }
        }
    }
}