An exception occurred in driver: SQLSTATE[HY000] [2002] Connection refused

After the comand php bin/console sylius:install I get now:

Using XAMPP instead of the mySQL Database solved the prob.

But then yarn install gave me:

dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.62.dylib
  Referenced from: /usr/local/bin/node
  Reason: image not found
Abort trap: 6

What helped me was executing the comands:
brew upgrade
and then
brew cleanup

Next Problem:

So I had to change memory_limit = -1 in php.ini to run
composer req webserver
successfully

Juhu - sylius up and running now!! :boom: :butterfly: :woman_mechanic: