Popper.js.map and bootstrap.min.js.map wont load

Hello! A new blank bootstrap 4 project with only blank index file shows two error in Browser console: 404 - Not found - File /bootstrap/js/bootstrap.min.js.map can not be read by Pinegrow: Error: ENOENT: no such file or directory, open /bootstrap/js/bootstrap.min.js.map’. The same happens for poppers.js.
It seems to me I havent seen these error before… Any ideas? Thanks!