pkg_resources.DistributionNotFound: The 'pipenv==2018.11.26' distribution was not found and is required by the application 에러 해결하기

pipenv 실행시 pkg_resources.DistributionNotFound가 발생하면

재설치를 진행한다. 

brew를 사용 중이라면

brew uninstall pipenv를 실행 후 

brew install pipenv를 실행한다