Middleman Re-install problem

Hi, i have tried to re-install, uninstall middleman because i have problems with.
But now i can’t finish installation.
When i bundle install, i get this:
[…]
Using middleman-cli 4.2.1
Fetching middleman 4.2.1
Installing middleman 4.2.1
Errno::EACCES: Permission denied @ rb_sysopen - /Users/username/.rbenv/versions/2.3.5/lib/ruby/gems/2.3.0/gems/middleman-4.2.1/.gemtest
An error occurred while installing middleman (4.2.1), and Bundler cannot continue.
Make sure that gem install middleman -v '4.2.1' succeeds before bundling.

In Gemfile:
middleman

If someone have an idea or better a solution ? :slight_smile: (Sorry for my english)

There’s issues like that sometimes with Ruby and his gems, when it happens to me I try by using sudo, then without and finally a simple bundle install and sometimes it works, I’ve never found another solution than to go there like a nag :confused: