Redmine

when i migrate plugin:
rake redmine:plugins:migrate RAILS_ENV=production
I get a rake aborted!

> #  rake redmine:plugins:migrate RAILS_ENV=production
> rake aborted!
> No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb, Rakefile.rb)
> /var/lib/gems/2.3.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
> (See full trace by running task with --trace)

then ,i assign Rakefile to the path "/var/lib/gems/2.3.0/gems/rake-12.0.0/exe/rake"

> # rake db:migrate:upgrade_plugin_migrations RAILS_ENV=production  -f /var/lib/gems/2.3.0/gems/rake-12.0.0/Rakefile --trace
> rake aborted!
> Unable to determine name from existing gemspec. Use :name => 'gemname' in #install_tasks to manually set it.
> /usr/lib/ruby/vendor_ruby/bundler/gem_helper.rb:29:in `initialize'
> /usr/lib/ruby/vendor_ruby/bundler/gem_helper.rb:13:in `new'
> /usr/lib/ruby/vendor_ruby/bundler/gem_helper.rb:13:in `install_tasks'
> /usr/lib/ruby/vendor_ruby/bundler/gem_tasks.rb:5:in `<top (required)>'
> /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
> /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/Rakefile:13:in `<top (required)>'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/rake_module.rb:28:in `load'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/rake_module.rb:28:in `load_rakefile'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:687:in `raw_load_rakefile'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:96:in `block in load_rakefile'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:95:in `load_rakefile'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:79:in `block in run'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:77:in `run'
> /var/lib/gems/2.3.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
> /usr/local/bin/rake:23:in `load'
> /usr/local/bin/rake:23:in `<main>'

Could you help me ?