cocoaPods pod install Permission denied

Question

This is the short version:

When I run

pod install 

in an Xcode project I get

[!] Pod::Executable pull erro

Answer 1

Answering the original question:

Is sudo installation of cocoaPods the wrong way or normal way? 

When I do a pod install I get:

Analyzing dependencies
CocoaPods 0.36.0.beta.1 is available.
To update use: `sudo gem install cocoapods --pre` 

so I assume sudo is OK.