[Rails] cannor rake db:create

I get this error message

denniss$ rake db:create
(in /Users/denniss/Documents/RoR/blog)
Couldn't create database for {"adapter"=>"mysql", "database"=>"blog",
"encoding"=>"utf8", "pool"=>5, "username"=>"root",
"password"=>"denniss",
"socket"=>"/Applications/rubystack/mysql/tmp/mysql.sock"}, charset:
utf8, collation: utf8_unicode_ci (if you set the charset manually, make
sure you have a matching collation)

note that I installed rubystack but I always use the ruby inside

denniss$ which ruby
/usr/local/bin/ruby

denniss$ which mysql
/Applications/rubystack/mysql/bin/mysql
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