LoadError: cannot load such file -- gserver - ruby-on-rails

Question

I think I messed up one of my projects and now it won't run almost any command.
Initially I installed all through RVM. The Gemfile shows rails 4.1.3
After some time I think I may tried to update rails and started a couple of other projects which rails version is 4.2.0 and both run fine.
Recently I went back on the first project to deploy it. I was configuring Capistrano when I noticed that I couldn't run any development commands on my working machine. First I tried to run the server but this error appeared:
$ rails server
bin/rails:6: warning: already initialized constant APP_PATH
/home/axl/coding/bfq/bin/rails:6: warning: previous definition of APP_PATH was here
Usage: rails COMMAND [ARGS]
The most common rails commands are:
generate Generate new code (short-cut alias: "g")
console Start the Rails console (short-cut alias: "c")
server Start the Rails server (short-cut alias: "s")
dbconsole Start a console for the database specified in config/database.yml
(short-cut alias: "db")
new Create a new Rails application. "rails new my_app" creates a
new application called MyApp in "./my_app"
In addition to those, there are:
application Generate the Rails application code
destroy Undo code generated with "generate" (short-cut alias: "d")
plugin new Generates skeleton for developing a Rails plugin
runner Run a piece of code in the application environment (short-cut alias: "r")
All commands can be run with -h (or --help) for more information.
So I thought maybe I screw something with Capistrano so I returned to branch master but the error was still there.
Any rake call returns this:
$ rake db:setup
rake aborted!
Gem::LoadError: You have already activated rake 10.4.2, but your Gemfile requires rake 10.3.2. Prepending `bundle exec` to your command may solve this.
/home/axl/coding/bfq/config/boot.rb:4:in `<top (required)>'
/home/axl/coding/bfq/config/application.rb:1:in `<top (required)>'
/home/axl/coding/bfq fiscal-quadrum/Rakefile:4:in `<top (required)>'
LoadError: cannot load such file -- bundler/setup
/home/axl/coding/bfq/config/boot.rb:4:in `<top (required)>'
/home/axl/coding/bfq/config/application.rb:1:in `<top (required)>'
/home/axl/coding/bfq/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)
Prepending bundle exec as suggested shows another error. For example:
$ bundle exec rake db:setup
rake aborted!
LoadError: cannot load such file -- gserver
/home/axl/coding/bfq/config/application.rb:7:in `<top (required)>'
/home/axl/coding/bfq/Rakefile:4:in `require'
/home/axl/coding/bfq/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)
There are similar cases, error bin/rails:6: warning: already initialized constant APP_PATH is related to spring gem. Running rake rails:update:bin seems to help but I can't run it since rake doesn't work at all.
So I tried reinstalling RVM. But nothing changed. I even removed RVM and installed Rbenv. But everything is exactly the same.
Versions inside the project:
$ ruby --version
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]
$ gem --version
2.4.5
$ rake --version
rake, version 10.4.2
$ rails --version
Rails 4.1.6
bundle update does some updates but after that executing rake shows the same error as prepending bundle exec:
$ rake
rake aborted!
LoadError: cannot load such file -- gserver
/home/axl/coding/bfq/config/application.rb:7:in `<top (required)>'
/home/axl/coding/bfq/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)
And there is nothing useful googling LoadError: cannot load such file -- gserver
Please, help me :'(

Answer 1

Shame on me. I didn't define ruby local version for the project.
When using RVM:
$ rvm install 2.1.1
$ rvm use 2.1.1
For Rbenv:
$ rbenv install 2.1.1
$ rbenv local 2.1.1