安装cocoapods出现以下错误，请问有哪位知道应该如何解决吗？

ERROR:  While executing gem ... (Gem::DependencyError)

    Unable to resolve dependencies: cocoapods requires cocoapods-core (= 0.33.1), claide (~> 0.6.1), cocoapods-downloader (~> 0.6.1), cocoapods-plugins (~> 0.2.0), cocoapods-try (~> 0.3.0), cocoapods-trunk (~> 0.1.1), nap (~> 0.7)