ActionView::Template::Error (couldn't find file ) - ruby-on-rails

Question

I've updated my app to rails 5.1 and spree to spree 3.5 this caused several problems with the latest being.
ActionView::Template::Error (couldn't find file 'jquery.validate/jquery.validate.min' with type 'application/javascript'
I've tried installing the gems like gem 'jquery-rails' gem 'rails-ujs,'~> 0.1.0' gem "jquery-ui-rails" gem 'jquery-validation-rails' and even added the files to my JavaScript folder.
Still no succes.
Anyone know the cause of the problem and how to solve it?
gemfile
source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails'
# Use sqlite3 as the database for Active Record
# gem 'sqlite3'
gem 'pg', '< 1'
# Use SCSS for stylesheets
gem 'sass-rails'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails'
# See https://github.com/rails/execjs#readme for more supported runtimes
gem 'therubyracer', platforms: :ruby
gem 'truncate_html', '~> 0.9.3'
# Use jquery as the JavaScript library
gem 'jquery-rails'
gem 'rails-ujs', '~> 0.1.0'
gem "jquery-ui-rails"
gem 'jquery-validation-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', group: :doc
gem 'rake'
gem 'rspec'
gem 'kramdown'
gem 'thor', '0.19.1'
gem 'spree_braintree_vzero', github: 'spree-contrib/spree_braintree_vzero'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use Unicorn as the app server
# gem 'unicorn'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug'
gem 'capistrano-passenger'
gem 'capistrano-rails'
gem 'capistrano-rvm'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> in views
gem 'web-console', '~> 2.0'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
end
gem 'spree', '~> 3.5.0.rc2'
gem 'spree_auth_devise', '~> 3.3'
gem 'spree_gateway', '~> 3.3'
gem 'devise'
gem 'materialize-sass'
gem 'active_link_to'
#gem 'mollie-api-ruby', '< 3.2'
# gem 'spree_mollie', github: 'salman15/mollie_spree_2017', branch: 'stable'
#gem 'spree_mollie', github: 'ttcremers/spree_mollie', branch: 'stable'
gem 'spree_mail_settings', github: 'spree-contrib/spree_mail_settings'
# gem 'spree_i18n', github: 'spree-contrib/spree_i18n'
# gem 'spree_globalize', github: 'spree-contrib/spree_globalize', branch: 'master'
gem "mini_magick"
gem 'spree_mollie_gateway'
# gem 'rails-i18n', github: 'svenfuchs/rails-i18n', branch: 'rails-4-x' # For 4.x
# gem 'globalize', '~> 5.1.0'
all.js/application.js
// This is a manifest file that'll be compiled into including all the files listed below.
// Add new JavaScript/Coffee code in separate files in this directory and they'll automatically
// be included in the compiled file accessible from http://example.com/assets/application.js
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// the compiled file.
//
//= require jquery
//= require jquery_ujs
//= require jquery.validate
//= require spree/frontend
//= require_tree .
//= require spree/frontend/spree_auth
//= require spree/frontend/spree_braintree_vzero

Answer 1

This fixed the problem for me: I just removed the line
//= require jquery.validate/jquery.validate.min
from frontend.js