Resolving Rails Server Error issues

sam@linux-qo4p:~/front/ror|master⚡⇒  Rails Server
Ignoring RedCloth-4.2.9 because it extensions are not built.  Try:gem Pristine RedCloth-4.2.9
Ignoring posix-spawn-0.3.9 because its extensions are not built.  T Ry:gem pristine posix-spawn-0.3.9
Ignoring rdiscount-2.1.7.1 because its extensions are not built.  try:gem pri Stine rdiscount-2.1.7.1
/usr/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:54:in ' require ': Cannot load such file--Bundler/setup (loaderror)
        from/usr/lib/ruby/ Site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:54:in ' require '
         From/home/sam/front/ror/config/boot.rb:4:in ' <top (required) > '
         from Bin/rails:3:in ' require_relative '
        from Bin/rails:3: In ' <main> '

This seems to be the mistake I made when I upgraded the OpenSUSE system from 13.1 to 13.2.
In my case, try the hint method in the error message the gem pristine Redcloth does not eliminate the above error.
The Final Solution is:

Gem Pristine--all

Switch to the project root directory, bundle install

Run the Rails server again, you can start correctly without error. Since then, the new project from rails new is no longer an error