I am following this link : http://railsapps.github.io/installrubyonrails-mac.html to set up my ROR environment, I have successfully upgraded to MacOS Sierra and also installed Xcode with command line tools but unfortunately when I type gcc in terminal I get the following result
Alis-MacBook-Pro:~ aliahmad$ gcc
xcrun: error: invalid active developer path
(/Library/Developer/CommandLineTools), missing xcrun at:
/Library/Developer/CommandLineTools/usr/bin/xcrun
I don't know what does it mean can someone please assist me to sort it out it will be so helpful for me.