Running pod setup gives me "bad interpreter: No such file or directory" error

Question

I encountered this problem when upgrading to Mac OS High Sierra.

This was my fix:

sudo gem install cocoapods

I found this answer on the CocoaPods issue list on Github.

This happened when I upgraded to Catalina. I solved it by running:

sudo gem install -n /usr/local/bin ruby
sudo gem install -n /usr/local/bin cocoapods

After upgraded to High Sierra, I got the same error, just reinstalled the cocoapods

sudo gem install -n /usr/local/bin cocoapods

Same issue I was facing when I updated our system from Sierra to Mojave. Also works for Catalina

The following steps worked:

sudo gem update --system
sudo gem install -n /usr/local/bin cocoapods

I got the help from the following link.

brew link --overwrite cocoapods

This line saved my day.

i fixed it by running brew install ruby