Unknown MySQL server host 'mysql-scenariopole.alwaysdata.net' (-2)

/home/icare/.gem/ruby/2.7.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:97:in `connect'

/home/icare/.gem/ruby/2.7.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:97:in `initialize'

/home/icare/www/scenariopole/BOA/lib/deep/deeper/required/Site/mysql/mysql.rb:192:in `new'

/home/icare/www/scenariopole/BOA/lib/deep/deeper/required/Site/mysql/mysql.rb:192:in `client'

/home/icare/www/scenariopole/BOA/lib/deep/deeper/required/Site/mysql/mysql.rb:315:in `create'

/home/icare/www/scenariopole/BOA/lib/deep/deeper/required/Site/mysql/mysql.rb:310:in `create_if_needed'

/home/icare/www/scenariopole/BOA/lib/deep/deeper/required/Site/mysql/mysql.rb:58:in `get'

/home/icare/www/scenariopole/BOA/lib/deep/deeper/required/Site/mysql/mysql.rb:6:in `dbm_table'

/home/icare/www/scenariopole/BOA/lib/deep/deeper/required/Site/connexions.rb:26:in `add_connexion'

/home/icare/www/scenariopole/BOA/lib/app/required/user/do_after_login.rb:21:in `do_after_load'

/home/icare/www/scenariopole/BOA/lib/preambule.rb:18:in `execute_preambule'

/home/icare/www/scenariopole/BOA/lib/required.rb:106:in `'

/usr/alwaysdata/ruby/2.7.1/lib/ruby/site_ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in `require'

/home/icare/www/scenariopole/BOA/index.rb:7:in `