I was deploying rails version on the server by using capistrano gem
but it informing me
Could not find rake-12.3.1 in any of the sources
after that I used bundle update to update the bundle and my gemfile but the issue still with me.
then I removed all the Gemfile.lock content and used bundle install and still get the same issue!!!
BTW I checked my vendor/cache and found it contain the file rake-12.3.1.gem and my gem file also contain gem 'rake', '12.3.1'
so why I got this issue?!
Can anyone help me to fix it?!