Why do i get this error when starting msf? msfconsole msfvenom

Commands:

root@kali:/usr/share/metasploit-framework/lib/msf/core/payload# gedit android.rb

#cert.not_after = cert.not_before + 3600*24*365*20 # 20 years
 cert.not_after = cert.not_before + 3600*24*365*2 # 2 years