PHPBB3 Import failling at first stage

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I’m having trouble running import_phpbb3.sh inside the import container. I had to restart the mysql by using the commands

/etc/init.d/mysql stop

and

/etc/init.d/mysql start

then I could enter the import container, where I ran import_phpbb3.sh, but it failed:

root@mydiscourse-import:/var/www/discourse# import_phpbb3.sh

The phpBB3 import is starting...

**Traceback** (most recent call last):

9: from script/import_scripts/phpbb3.rb:13:in `<main>'

8: from script/import_scripts/phpbb3.rb:14:in `<module:ImportScripts>'

7: from script/import_scripts/phpbb3.rb:26:in `<module:PhpBB3>'

6: from /var/www/discourse/script/import_scripts/phpbb3/database/database.rb:9:in `create'

5: from /var/www/discourse/script/import_scripts/phpbb3/database/database.rb:9:in `new'

4: from /var/www/discourse/script/import_scripts/phpbb3/database/database.rb:15:in `initialize'

3: from /var/www/discourse/script/import_scripts/phpbb3/database/database.rb:39:in `create_database_client'

2: from /var/www/discourse/script/import_scripts/phpbb3/database/database.rb:39:in `new'

1: from /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/mysql2-0.5.2/lib/mysql2/client.rb:90:in `initialize'

/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/mysql2-0.5.2/lib/mysql2/client.rb:90:in `connect': **Access denied for user 'root'@'localhost' (** **Mysql2::Error** **)**

Can you suggest how to proceed?