NoMethodError: undefined method `+' for nil:NilClass / 'additional_paths' [capistrano+webpacker]

ruby-on-rails ruby webpack capistrano

In your config/webpacker.yml, resolved_paths has been deprecated and should be replaced by additional_paths (https://github.com/rails/webpacker/commit/0adb3dc342addaa00122f9b022bf05606225c39c#diff-04c6e90faac2675aa89e2176d2eec7d8R365)

I hope this helps, I ran in the same issue and this fixed my problem.