Metasploit Error

Hello,
when i try to use metasploit like youtube video i get a message ( Unable to find a spec satisfying metasploit-framework ) and then after i reinstall ruby i get this message ( ERROR: While executing gem … (Gem::FilePermissionError) You don’t have write permissions for the /var/lib/gems/2.7.0 directory. ) so please i need help

Hello, please read the guidelines before posting.

As for your question, what distribution are you using?

i’m using kali linux virtual box

This is an issue with the upgrade process with Metasploit, i would recommend uninstalling it completely and installing the latest version directly from the Kali repositories.