LoadError: cannot load such file — bcrypt_ext on Windows 2008 x64 server

Question

I upgraded my environment from Ruby 2.0.0 to 2.2.3.

I also upgraded (overwrite) DevKit, and re-run ruby dk.rb install.

I removed Gemfile.lock and ran bundle

Answer 1

This works for me, add this to your gems file:

gem 'bcrypt', '~> 3.1.7', platform: :ruby

Answer 2

What worked for me on Windows 7:

1. gem uninstall bcrypt to uninstall all versions of bcrypt, including those listed as dependencies
2. gem install bcrypt to reinstall
3. bundle install

Answer 3

Solution was here: bcrypt-ruby@github:

Rebuild locally the bcrypt gem:

1. Change to the gem directory \Ruby22-x64\lib\ruby\gems\2.2.0\gems\bcrypt-3.1.10-x64-mingw32\ext\mri>
2. Run ruby extconf.rb
3. Run make
4. Run make install

Note that this works only if your DevKit environment is correctly setup (run devkitvars.bat).