Print error message and exit on similar names.
Print error message and exit on similar names.

pparkkin/eta,AlexeyRaga/eta,rahulmutt/ghcvm,AlexeyRaga/eta,pparkkin/eta,AlexeyRaga/eta,pparkkin/eta,pparkkin/eta,rahulmutt/ghcvm,AlexeyRaga/eta,rahulmutt/ghcvm,AlexeyRaga/eta,pparkkin/eta,rahulmutt/ghcvm,rahulmutt/ghcvm