npm err! code e404
npm err! 404 not found - get https://registry.npmjs.org/acorn/-/acorn-6.12.1.tgz
npm err! 404
npm err! 404 'acorn@6.12.1' is not in the npm registry.
npm err! 404 you should bug the author to publish it (or use the name yourself!)
npm err! 404 it was specified as a dependency of 'ui-ngx'
npm err! 404
npm err! 404 note that you can also install from a
npm err! 404 tarball, folder, http url, or git url.
npm err! a complete log of this run can be found in:
npm err! c:\program files\nodejs\node_cache\_logs\2020-06-02t08_35_50_411z-debug.log