Website error after Sylius/BootstrapTheme installation : public/bootstrap-theme/entrypoints.json does not exist

Hi,
After installing a standard Sylius Website, I have followed the 7 steps of installation of github Sylius BootstrapTheme (https://github.com/Sylius/BootstrapTheme).
All seems to be OK excepted when I want to display index page of my shop website because I have this following error that appears :

An exception has been thrown during the rendering of a template (“Could not find the entrypoints file from Webpack: the file “/var/www/html/dv2000/public/bootstrap-theme/entrypoints.json” does not exist.”).


Could you be kind to give me a solution ?
Best regards.
Eric.