Redmine

Good day.
Trying to install the plugin dmsf.
Action for instructions here Description: https://github.com/danmunn/redmine_dmsf
1. Download .zip archive, extract, copy to folder redmine_dmsf in redmine / plugins
2. Run rake redmine: plugins: migrate RAILS_ENV = production
I receive the error message:
rake aborted!
LoadError: can not load such file - / disk2 / www / config / environment
/disk2/www/redmine/plugins/redmine_dmsf/lib/tasks/dmsf_convert_documents.rake:32
: in `<top (required)> '
/disk2/www/redmine/lib/tasks/redmine.rake:179:in `block in <top (required)> '
/disk2/www/redmine/lib/tasks/redmine.rake:179:in `each '
/disk2/www/redmine/lib/tasks/redmine.rake:179:in `<top (required)> '
/ disk2 / www / redmine / Rakefile: 7: in `<top (required)> '
(See full trace by running task with --trace)
3. Tried to put the right chown -R www: www redmine / plugins / redmine_dmsf; installed rubyzip, dev4rack, still get the error. After restart apache redmine not running. After removing the plug and me after restarting apache redmine starts.
What am I doing wrong when installing the plugin? Help please.