```ruby
# encoding: utf-8
module Spree
  module Admin
    class SuppliersController < ResourceController
      respond_to :html
      
    end
  end
end
```

Remove respond_to as it is not needed
user
```ruby
# encoding: utf-8
module Spree
  module Admin
    class SuppliersController < ResourceController
    end
  end
end
```
assistant