Unity build error: Error running cocoapods

After adding Firebase SDK and trying to build for iOS I get this error in Unity when building:

"Error running cocoapods. Please ensure you have at least version 1.0.0. You can install cocoapods with the Ruby gem package manager:
> sudo gem install -n /usr/local/bin cocoapods
> pod setup

'pod --version' returned status: 127"

But I do have cocoapods installed. I gem installed (as sudo and not as sudo), and when I run pod --version I get:
1.2.0

Any ideas why this is happening?