You can manually edit the file manifest.json via FTP and change the start url to /app
optionally, change service worker version and regenerate whcich would overwrite it. In case it does not overwrite, delete the manifest.json via FTP and try regenerating again.
here is the issue: http://somup.com/c3QfbfUqzC
i have defind everything then why is it causing the issue
Yes, the start url in your manifest is set to false.
https://datasciences.io/manifest.json ( start_url is set to false )
You can manually edit the file manifest.json via FTP and change the start url to /app
optionally, change service worker version and regenerate whcich would overwrite it. In case it does not overwrite, delete the manifest.json via FTP and try regenerating again.