Cannot access file when finished download

[dungvt]

Hi all,
I have an issue about download 7z file:
My option:

        dl.setOptions({
            threadsCount: 5,    // Default: 2, Set the total number of download threads
            method: 'GET',      // Default: GET, HTTP method
            port: 80,           // Default: 80, HTTP port
            timeout: 10000,     // Default: 5000, If no data is received, the download times out (milliseconds)
            range: '0-100',     // Default: 0-100, Control the part of file that needs to be downloaded.
        });

Handle event:

        dl.on('error', function () {
            logger.error(`Download error: ${dl.error}`);
            reject(
                {
                    error: dl.error,
                    return: null
                }
            );
        });
        dl.on('end', function () {
            logger.info(`Download done: ${local_file}`);
            resolve(`Remote: ${remote_file}. Local: ${local_file}`);
        });

Then i call start download file.
This file type is 7z, i will extract it when finished, so when resolve statement of promise, i call extractor tool. But i got an exception:

System ERROR:
The process cannot access the file because it is being used by another process.

I think downloader not yet finished at "end" event. Check my local folder, the downloaded file is corrupted.
Have you solution for this?
Thanks for reading.