Problem upgrade rails version permission denied rvm folder /bin/rails

Hi, I try to install rails 3.2.20 with ruby2.2.0.

So with rvm I make

rvm install 2.2.0

After I make

gem install rails -v 3.2.20

After rvm use default ruby-2.2.2

But when I try rails -v, I have the error

-bash: /home/xxx/.rvm/gems/ruby-2.2.0/bin/rails: Permission denied

Why? I try also chmod -R 777 on .rvm but nothing change